feat: Seamless sleep/wake screens for displaying book pages during deep sleep (#2064)

<img width="605" height="454" alt="image"
src="https://github.com/user-attachments/assets/bfd84afe-3b58-436e-9a5d-539af3ec3d4e"
/>

Actualized "Last" sleep screen setting from previous PRs, rebranded as a
~~`Seamless Sleep`~~ `Page as Sleep Screen` option with more
improvements.


https://github.com/user-attachments/assets/59029ba6-007e-4841-abfa-f680d7e98b79

---

New option: `Page as Sleep Screen` - `Never (default)`, `After Timeout`,
`Always`

When enabled, it seamlessly sleeps on timeout or power off, making a
fast refresh for the moon icon. When waking up, we still show the last
page, instead of the boot screen, making it fully seamless.

I tried different icons such as "refresh arrow" and others, but they
looked not as nice as 3 simple dots.

With this mode, the device turns off 4 seconds faster. And has 6 seconds
less delay when turning back on. Much more responsive.

Previously, even a 10-minute timeout sometimes wasn't enough, and I'd
worry about seeing the book cover. It's now easier to use a shorter
sleep timeout: if I get distracted during a reading session but don't
want to stop, the new screen is much more inviting to come back to.

---

Did you use AI tools to help write this code? _**PARTIALLY**_.

---

Test v1.3.0 firmware.bin file
[download](https://github.com/user-attachments/files/28015193/firmware.zip)

Based on PRs #410 and #495

Closes #400, #1649

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/I18n/translations/belarusian.yaml

@@ -206,6 +206,8 @@ STR_THEME_CLASSIC: "Класічная"
 STR_THEME_LYRA: "Lyra"
 STR_THEME_LYRA_EXTENDED: "Lyra Extended"
 STR_SUNLIGHT_FADING_FIX: "Кампенсацыя выцвітання"
+STR_SEAMLESS_SLEEP: "Старонка як экран сну"
+STR_AFTER_TIMEOUT: "Пасля таймаўту"
 STR_REMAP_FRONT_BUTTONS: "Пераназначыць пярэднія кнопкі"
 STR_OPDS_BROWSER: "OPDS браўзер"
 STR_COVER_CUSTOM: "Вокладка + Свой"

lib/I18n/translations/catalan.yaml

@@ -234,6 +234,8 @@ STR_THEME_CLASSIC: "Clàssic"
 STR_THEME_LYRA: "Lyra"
 STR_THEME_LYRA_EXTENDED: "Lyra Ampliat"
 STR_SUNLIGHT_FADING_FIX: "Correcció de l'esvaïment pel sol"
+STR_SEAMLESS_SLEEP: "Pàgina com a repòs"
+STR_AFTER_TIMEOUT: "Després del temps"
 STR_REMAP_FRONT_BUTTONS: "Reassigna els botons frontals"
 STR_OPDS_BROWSER: "Navegador OPDS"
 STR_COVER_CUSTOM: "Portada + Personalitzat"

lib/I18n/translations/czech.yaml

@@ -212,6 +212,8 @@ STR_THEME_LYRA: "Lyra"
 STR_THEME_ROUNDEDRAFF: "RoundedRaff"
 STR_THEME_LYRA_EXTENDED: "Lyra Extended"
 STR_SUNLIGHT_FADING_FIX: "Oprava blednutí na slunci"
+STR_SEAMLESS_SLEEP: "Stránka jako spánek"
+STR_AFTER_TIMEOUT: "Po vypršení"
 STR_REMAP_FRONT_BUTTONS: "Přemapovat přední tlačítka"
 STR_OPDS_BROWSER: "Prohlížeč OPDS"
 STR_COVER_CUSTOM: "Obálka + Vlastní"

lib/I18n/translations/danish.yaml

@@ -234,6 +234,8 @@ STR_THEME_CLASSIC: "Klassisk"
 STR_THEME_LYRA: "Lyra"
 STR_THEME_LYRA_EXTENDED: "Lyra Extended"
 STR_SUNLIGHT_FADING_FIX: "Sollysfading-rettelse"
+STR_SEAMLESS_SLEEP: "Side som dvaleskærm"
+STR_AFTER_TIMEOUT: "Efter timeout"
 STR_REMAP_FRONT_BUTTONS: "Omtildel frontknapper"
 STR_OPDS_BROWSER: "OPDS Browser"
 STR_COVER_CUSTOM: "Omslag + Brugerdefineret"

lib/I18n/translations/dutch.yaml

@@ -234,6 +234,8 @@ STR_THEME_CLASSIC: "Klassiek"
 STR_THEME_LYRA: "Lyra"
 STR_THEME_LYRA_EXTENDED: "Lyra Uitgebreid"
 STR_SUNLIGHT_FADING_FIX: "Zonlicht vervaging fix"
+STR_SEAMLESS_SLEEP: "Pagina als slaapscherm"
+STR_AFTER_TIMEOUT: "Na timeout"
 STR_REMAP_FRONT_BUTTONS: "Knoppen voorzijde wijzigen"
 STR_OPDS_BROWSER: "OPDS-browser"
 STR_COVER_CUSTOM: "Omslag + Aangepast"

lib/I18n/translations/english.yaml

@@ -62,6 +62,8 @@ STR_CAT_READER: "Reader"
 STR_CAT_CONTROLS: "Controls"
 STR_CAT_SYSTEM: "System"
 STR_SLEEP_SCREEN: "Sleep Screen"
+STR_SEAMLESS_SLEEP: "Page as Sleep Screen"
+STR_AFTER_TIMEOUT: "After Timeout"
 STR_SLEEP_COVER_MODE: "Sleep Screen Cover Mode"
 STR_HIDE_BATTERY: "Hide Battery %"
 STR_EXTRA_SPACING: "Extra Paragraph Spacing"

lib/I18n/translations/finnish.yaml

@@ -211,6 +211,8 @@ STR_THEME_CLASSIC: "Klassinen"
 STR_THEME_LYRA: "Lyra"
 STR_THEME_LYRA_EXTENDED: "Lyra Extended"
 STR_SUNLIGHT_FADING_FIX: "Auringonvalon haalistumiskorjaus"
+STR_SEAMLESS_SLEEP: "Sivu lepotilassa"
+STR_AFTER_TIMEOUT: "Aikakatkon jälkeen"
 STR_REMAP_FRONT_BUTTONS: "Uudelleenmääritä etupainikkeet"
 STR_OPDS_BROWSER: "OPDS-selain"
 STR_COVER_CUSTOM: "Kansi + mukautettu"

lib/I18n/translations/french.yaml

@@ -235,6 +235,8 @@ STR_THEME_LYRA: "Lyra"
 STR_THEME_ROUNDEDRAFF: "RoundedRaff"
 STR_THEME_LYRA_EXTENDED: "Lyra Extended"
 STR_SUNLIGHT_FADING_FIX: "Correction lisibilité au soleil"
+STR_SEAMLESS_SLEEP: "Page comme veille"
+STR_AFTER_TIMEOUT: "Après délai"
 STR_REMAP_FRONT_BUTTONS: "Configurer boutons façade"
 STR_OPDS_BROWSER: "Navigateur OPDS"
 STR_COVER_CUSTOM: "Couverture + Perso"

lib/I18n/translations/german.yaml

@@ -233,6 +233,8 @@ STR_THEME_LYRA: "Lyra"
 STR_THEME_ROUNDEDRAFF: "RoundedRaff"
 STR_THEME_LYRA_EXTENDED: "Lyra Extended"
 STR_SUNLIGHT_FADING_FIX: "Anti-Verblassen"
+STR_SEAMLESS_SLEEP: "Seite als Ruhebild"
+STR_AFTER_TIMEOUT: "Nach Timeout"
 STR_REMAP_FRONT_BUTTONS: "Vordere Tasten belegen"
 STR_OPDS_BROWSER: "OPDS-Browser"
 STR_COVER_CUSTOM: "Umschlag + Eigenes"

lib/I18n/translations/hungarian.yaml

@@ -231,6 +231,8 @@ STR_THEME_CLASSIC: "Klasszikus"
 STR_THEME_LYRA: "Lyra"
 STR_THEME_LYRA_EXTENDED: "Lyra Extended"
 STR_SUNLIGHT_FADING_FIX: "Napfény halványulás javítás"
+STR_SEAMLESS_SLEEP: "Oldal alvóképernyő"
+STR_AFTER_TIMEOUT: "Időtúllépés után"
 STR_REMAP_FRONT_BUTTONS: "Elülső gombok átállítása"
 STR_OPDS_BROWSER: "OPDS böngésző"
 STR_COVER_CUSTOM: "Borító + Egyéni"

lib/I18n/translations/italian.yaml

@@ -242,6 +242,8 @@ STR_THEME_LYRA: "Lyra"
 STR_THEME_ROUNDEDRAFF: "RoundedRaff"
 STR_THEME_LYRA_EXTENDED: "Lyra esteso"
 STR_SUNLIGHT_FADING_FIX: "Correzione luce solare"
+STR_SEAMLESS_SLEEP: "Pagina come standby"
+STR_AFTER_TIMEOUT: "Dopo timeout"
 STR_REMAP_FRONT_BUTTONS: "Rimappa pulsanti frontali"
 STR_OPDS_BROWSER: "Browser OPDS"
 STR_SEARCH: "Cerca"

lib/I18n/translations/kazakh.yaml

@@ -207,6 +207,8 @@ STR_THEME_CLASSIC: "Классикалық"
 STR_THEME_LYRA: "Lyra"
 STR_THEME_LYRA_EXTENDED: "Lyra кеңейтілген"
 STR_SUNLIGHT_FADING_FIX: "Күн сәулесінен солу түзету"
+STR_SEAMLESS_SLEEP: "Бет – ұйқы экраны"
+STR_AFTER_TIMEOUT: "Таймауттан кейін"
 STR_REMAP_FRONT_BUTTONS: "Алдыңғы түймелерді қайта баптау"
 STR_OPDS_BROWSER: "OPDS шолғышы"
 STR_COVER_CUSTOM: "Мұқаба + Өзгертілген"

lib/I18n/translations/lithuanian.yaml

@@ -231,6 +231,8 @@ STR_THEME_CLASSIC: "Klasikinė"
 STR_THEME_LYRA: "Lyra"
 STR_THEME_LYRA_EXTENDED: "Lyra Ext."
 STR_SUNLIGHT_FADING_FIX: "Blyškumo pataisa"
+STR_SEAMLESS_SLEEP: "Puslapis miego ekrane"
+STR_AFTER_TIMEOUT: "Po skirtojo laiko"
 STR_REMAP_FRONT_BUTTONS: "Keisti mygtukus"
 STR_OPDS_BROWSER: "OPDS naršyklė"
 STR_COVER_CUSTOM: "Viršelis + Kita"

lib/I18n/translations/polish.yaml

@@ -242,6 +242,8 @@ STR_THEME_LYRA: "Lyra"
 STR_THEME_ROUNDEDRAFF: "RoundedRaff"
 STR_THEME_LYRA_EXTENDED: "Lyra Extended"
 STR_SUNLIGHT_FADING_FIX: "Przeciwdziałanie blaknięciu od słońca"
+STR_SEAMLESS_SLEEP: "Strona jako ekran snu"
+STR_AFTER_TIMEOUT: "Po upływie czasu"
 STR_REMAP_FRONT_BUTTONS: "Skonfiguruj przednie przyciski"
 STR_OPDS_BROWSER: "OPDS Browser"
 STR_SEARCH: "Szukaj"

lib/I18n/translations/portuguese.yaml

@@ -212,6 +212,8 @@ STR_THEME_LYRA: "Lyra"
 STR_THEME_ROUNDEDRAFF: "RoundedRaff"
 STR_THEME_LYRA_EXTENDED: "Lyra Extended"
 STR_SUNLIGHT_FADING_FIX: "Ajuste desbotamento ao sol"
+STR_SEAMLESS_SLEEP: "Página como repouso"
+STR_AFTER_TIMEOUT: "Após tempo limite"
 STR_REMAP_FRONT_BUTTONS: "Remapear botões frontais"
 STR_OPDS_BROWSER: "Navegador OPDS"
 STR_COVER_CUSTOM: "Capa + personalizado"

lib/I18n/translations/romanian.yaml

@@ -234,6 +234,8 @@ STR_THEME_CLASSIC: "Clasic"
 STR_THEME_LYRA: "Lyra"
 STR_THEME_LYRA_EXTENDED: "Lyra Extended"
 STR_SUNLIGHT_FADING_FIX: "Corecţie estompare lumină"
+STR_SEAMLESS_SLEEP: "Pagină ca repaus"
+STR_AFTER_TIMEOUT: "După timeout"
 STR_REMAP_FRONT_BUTTONS: "Remapare butoane frontale"
 STR_OPDS_BROWSER: "Browser OPDS"
 STR_COVER_CUSTOM: "Copertă + Personalizat"

lib/I18n/translations/russian.yaml

@@ -242,6 +242,8 @@ STR_THEME_LYRA: "Lyra"
 STR_THEME_ROUNDEDRAFF: "RoundedRaff"
 STR_THEME_LYRA_EXTENDED: "Lyra Extended"
 STR_SUNLIGHT_FADING_FIX: "Компенсация выцветания"
+STR_SEAMLESS_SLEEP: "Страница как экран сна"
+STR_AFTER_TIMEOUT: "По таймауту"
 STR_REMAP_FRONT_BUTTONS: "Переназначить передние кнопки"
 STR_OPDS_BROWSER: "OPDS браузер"
 STR_SEARCH: "Поиск"

lib/I18n/translations/slovenian.yaml

@@ -231,6 +231,8 @@ STR_THEME_CLASSIC: "Klasična"
 STR_THEME_LYRA: "Lyra"
 STR_THEME_LYRA_EXTENDED: "Lyra razširjena"
 STR_SUNLIGHT_FADING_FIX: "Popravek bledenja na soncu"
+STR_SEAMLESS_SLEEP: "Stran kot zaslon sna"
+STR_AFTER_TIMEOUT: "Po izteku"
 STR_REMAP_FRONT_BUTTONS: "Prenastavi sprednje gumbe"
 STR_OPDS_BROWSER: "OPDS brskalnik"
 STR_COVER_CUSTOM: "Naslovnica + po meri"

lib/I18n/translations/spanish.yaml

@@ -242,6 +242,8 @@ STR_THEME_LYRA: "Lyra"
 STR_THEME_ROUNDEDRAFF: "RoundedRaff"
 STR_THEME_LYRA_EXTENDED: "Lyra Extendido"
 STR_SUNLIGHT_FADING_FIX: "Corrección de desvanecimiento"
+STR_SEAMLESS_SLEEP: "Página como reposo"
+STR_AFTER_TIMEOUT: "Tras tiempo"
 STR_REMAP_FRONT_BUTTONS: "Reconfigurar botones frontales"
 STR_OPDS_BROWSER: "Navegador OPDS"
 STR_SEARCH: "Buscar"

lib/I18n/translations/swedish.yaml

@@ -242,6 +242,8 @@ STR_THEME_LYRA: "Lyra"
 STR_THEME_ROUNDEDRAFF: "RoundedRaff"
 STR_THEME_LYRA_EXTENDED: "Lyra utökad"
 STR_SUNLIGHT_FADING_FIX: "Fix för solskensmattning"
+STR_SEAMLESS_SLEEP: "Sida som viloskärm"
+STR_AFTER_TIMEOUT: "Efter timeout"
 STR_REMAP_FRONT_BUTTONS: "Ändra frontknappar"
 STR_OPDS_BROWSER: "OPDS-webbläsare"
 STR_SEARCH: "Sök"

lib/I18n/translations/turkish.yaml

@@ -211,6 +211,8 @@ STR_THEME_CLASSIC: "Klasik"
 STR_THEME_LYRA: "Lyra"
 STR_THEME_LYRA_EXTENDED: "Lyra Genişletilmiş"
 STR_SUNLIGHT_FADING_FIX: "Güneş Işığı Solma Düzeltmesi"
+STR_SEAMLESS_SLEEP: "Sayfa uyku ekranı"
+STR_AFTER_TIMEOUT: "Zaman aşımında"
 STR_REMAP_FRONT_BUTTONS: "Ön Tuşları Yeniden Ata"
 STR_OPDS_BROWSER: "OPDS Tarayıcı"
 STR_COVER_CUSTOM: "Kapak + Özel"

lib/I18n/translations/ukrainian.yaml

@@ -242,6 +242,8 @@ STR_THEME_LYRA: "Lyra"
 STR_THEME_ROUNDEDRAFF: "RoundedRaff"
 STR_THEME_LYRA_EXTENDED: "Lyra Extended"
 STR_SUNLIGHT_FADING_FIX: "Виправлення вицвітання на сонці"
+STR_SEAMLESS_SLEEP: "Сторінка як екран сну"
+STR_AFTER_TIMEOUT: "Після таймауту"
 STR_REMAP_FRONT_BUTTONS: "Налаштувати передні кнопки"
 STR_OPDS_BROWSER: "Браузер OPDS"
 STR_SEARCH: "Пошук"

lib/hal/HalDisplay.cpp

@@ -10,7 +10,7 @@ HalDisplay::HalDisplay() : einkDisplay(EPD_SCLK, EPD_MOSI, EPD_CS, EPD_DC, EPD_R
 
 HalDisplay::~HalDisplay() {}
 
-void HalDisplay::begin() {
+void HalDisplay::begin(bool seamless) {
   // Set X3-specific panel mode before initializing.
   if (gpio.deviceIsX3()) {
     einkDisplay.setDisplayX3();
@@ -18,11 +18,14 @@ void HalDisplay::begin() {
 
   einkDisplay.begin();
 
-  // Request resync after specific wakeup events to ensure clean display state
-  const auto wakeupReason = gpio.getWakeupReason();
-  if (wakeupReason == HalGPIO::WakeupReason::PowerButton || wakeupReason == HalGPIO::WakeupReason::AfterFlash ||
-      wakeupReason == HalGPIO::WakeupReason::Other) {
-    einkDisplay.requestResync();
+  // Request resync after specific wakeup events to ensure clean display state.
+  // Skip when seamless=true so the current screen content is preserved.
+  if (!seamless) {
+    const auto wakeupReason = gpio.getWakeupReason();
+    if (wakeupReason == HalGPIO::WakeupReason::PowerButton || wakeupReason == HalGPIO::WakeupReason::AfterFlash ||
+        wakeupReason == HalGPIO::WakeupReason::Other) {
+      einkDisplay.requestResync();
+    }
   }
 }
 

lib/hal/HalDisplay.h

@@ -18,7 +18,7 @@ class HalDisplay {
   };
 
   // Initialize the display hardware and driver
-  void begin();
+  void begin(bool seamless = false);
 
   // Display dimensions
   static constexpr uint16_t DISPLAY_WIDTH = EInkDisplay::DISPLAY_WIDTH;

src/CrossPointSettings.h

@@ -155,6 +155,13 @@ class CrossPointSettings {
 
   enum TILT_PAGE_TURN { TILT_OFF = 0, TILT_NORMAL = 1, TILT_NVERTED = 2, TILT_PAGE_TURN_COUNT };
 
+  enum SEAMLESS_SLEEP_SCREEN {
+    SEAMLESS_NEVER = 0,
+    SEAMLESS_AFTER_TIMEOUT = 1,
+    SEAMLESS_ALWAYS = 2,
+    SEAMLESS_SLEEP_SCREEN_COUNT
+  };
+
   // Sleep screen settings
   uint8_t sleepScreen = DARK;
   // Sleep screen cover mode settings
@@ -242,6 +249,8 @@ class CrossPointSettings {
   uint8_t tiltPageTurn = TILT_OFF;
   // Language setting (Language enum index, default 0 = EN)
   uint8_t language = 0;
+  // Seamless sleep: keep current content visible with moon icon instead of showing sleep screen
+  uint8_t seamlessSleepScreen = SEAMLESS_NEVER;
 
   ~CrossPointSettings() = default;
 

src/CrossPointState.h

@@ -15,6 +15,7 @@ class CrossPointState {
   uint8_t recentSleepFill = 0;                          // valid entries (0..SLEEP_RECENT_COUNT)
   uint8_t readerActivityLoadCount = 0;
   bool lastSleepFromReader = false;
+  bool showBootScreen = true;
 
   // Returns true if idx was shown within the last checkCount picks.
   // Walks backwards from the most recently written slot.

src/JsonSettingsIO.cpp

@@ -75,6 +75,7 @@ bool JsonSettingsIO::saveState(const CrossPointState& s, const char* path) {
   doc["recentSleepFill"] = s.recentSleepFill;
   doc["readerActivityLoadCount"] = s.readerActivityLoadCount;
   doc["lastSleepFromReader"] = s.lastSleepFromReader;
+  doc["showBootScreen"] = s.showBootScreen;
 
   String json;
   serializeJson(doc, json);
@@ -109,6 +110,7 @@ bool JsonSettingsIO::loadState(CrossPointState& s, const char* json) {
   }
   s.readerActivityLoadCount = doc["readerActivityLoadCount"] | static_cast<uint8_t>(0);
   s.lastSleepFromReader = doc["lastSleepFromReader"] | false;
+  s.showBootScreen = doc["showBootScreen"] | true;
   return true;
 }
 

src/SettingsList.h

@@ -113,6 +113,9 @@ inline std::vector<SettingInfo> getSettingsList(const SdCardFontRegistry* regist
         SettingInfo::Enum(StrId::STR_SLEEP_COVER_FILTER, &CrossPointSettings::sleepScreenCoverFilter,
                           {StrId::STR_NONE_OPT, StrId::STR_FILTER_CONTRAST, StrId::STR_INVERTED},
                           "sleepScreenCoverFilter", StrId::STR_CAT_DISPLAY),
+        SettingInfo::Enum(StrId::STR_SEAMLESS_SLEEP, &CrossPointSettings::seamlessSleepScreen,
+                          {StrId::STR_NEVER, StrId::STR_AFTER_TIMEOUT, StrId::STR_ALWAYS}, "seamlessSleepScreen",
+                          StrId::STR_CAT_DISPLAY),
         SettingInfo::Enum(StrId::STR_HIDE_BATTERY, &CrossPointSettings::hideBatteryPercentage,
                           {StrId::STR_NEVER, StrId::STR_IN_READER, StrId::STR_ALWAYS}, "hideBatteryPercentage",
                           StrId::STR_CAT_DISPLAY),

src/activities/ActivityManager.cpp

@@ -196,8 +196,8 @@ void ActivityManager::goToReader(std::string path) {
   replaceActivity(std::make_unique<ReaderActivity>(renderer, mappedInput, std::move(path)));
 }
 
-void ActivityManager::goToSleep() {
-  replaceActivity(std::make_unique<SleepActivity>(renderer, mappedInput));
+void ActivityManager::goToSleep(bool fromTimeout) {
+  replaceActivity(std::make_unique<SleepActivity>(renderer, mappedInput, fromTimeout));
   loop();  // Important: sleep screen must be rendered immediately, the caller will go to sleep right after this returns
 }
 

src/activities/ActivityManager.h

@@ -86,7 +86,7 @@ class ActivityManager {
   void goToRecentBooks();
   void goToBrowser();
   void goToReader(std::string path);
-  void goToSleep();
+  void goToSleep(bool fromTimeout = false);
   void goToBoot();
   void goToFullScreenMessage(std::string message, EpdFontFamily::Style style = EpdFontFamily::REGULAR);
   void goToCrashReport();

src/activities/boot_sleep/SleepActivity.cpp

@@ -14,10 +14,20 @@
 #include "components/UITheme.h"
 #include "fontIds.h"
 #include "images/Logo120.h"
+#include "images/MoonIcon.h"
 
 void SleepActivity::onEnter() {
   Activity::onEnter();
 
+  const bool renderSeamless =
+      SETTINGS.seamlessSleepScreen == CrossPointSettings::SEAMLESS_SLEEP_SCREEN::SEAMLESS_ALWAYS ||
+      (fromTimeout &&
+       SETTINGS.seamlessSleepScreen == CrossPointSettings::SEAMLESS_SLEEP_SCREEN::SEAMLESS_AFTER_TIMEOUT);
+
+  if (renderSeamless) {
+    return renderLastScreenSleepScreen();
+  }
+
   // Show popup with reader orientation only when going to sleep from reader
   if (APP_STATE.lastSleepFromReader) {
     ReaderUtils::applyOrientation(renderer, SETTINGS.orientation);
@@ -307,6 +317,12 @@ void SleepActivity::renderCoverSleepScreen() const {
   return (this->*renderNoCoverSleepScreen)();
 }
 
+void SleepActivity::renderLastScreenSleepScreen() const {
+  const auto pageHeight = renderer.getScreenHeight();
+  renderer.drawImage(MoonIcon, 0, pageHeight - MOONICON_HEIGHT, MOONICON_WIDTH, MOONICON_HEIGHT);
+  renderer.displayBuffer(HalDisplay::HALF_REFRESH);
+}
+
 void SleepActivity::renderBlankSleepScreen() const {
   renderer.clearScreen();
   renderer.displayBuffer(HalDisplay::HALF_REFRESH);

src/activities/boot_sleep/SleepActivity.h

@@ -5,8 +5,8 @@ class Bitmap;
 
 class SleepActivity final : public Activity {
  public:
-  explicit SleepActivity(GfxRenderer& renderer, MappedInputManager& mappedInput)
-      : Activity("Sleep", renderer, mappedInput) {}
+  explicit SleepActivity(GfxRenderer& renderer, MappedInputManager& mappedInput, bool fromTimeout = false)
+      : Activity("Sleep", renderer, mappedInput), fromTimeout(fromTimeout) {}
   void onEnter() override;
 
  private:
@@ -14,5 +14,8 @@ class SleepActivity final : public Activity {
   void renderCustomSleepScreen() const;
   void renderCoverSleepScreen() const;
   void renderBitmapSleepScreen(const Bitmap& bitmap) const;
+  void renderLastScreenSleepScreen() const;
   void renderBlankSleepScreen() const;
+
+  bool fromTimeout = false;
 };

src/images/LoadingIcon.h

@@ -0,0 +1,24 @@
+#pragma once
+#include <cstdint>
+
+// Image dimensions: 48x48, diagonal dots
+#define LOADINGICON_WIDTH 48
+#define LOADINGICON_HEIGHT 48
+
+static const uint8_t LoadingIcon[] = {
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x0f, 0xff,
+    0xff, 0xff, 0xff, 0xf8, 0x07, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x07, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x07, 0xff,
+    0xff, 0xff, 0xff, 0xf8, 0x07, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x0f, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x1f, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x0f, 0xff,
+    0xff, 0xff, 0xff, 0xf8, 0x07, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x07, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x07, 0xff,
+    0xff, 0xff, 0xff, 0xf8, 0x07, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x0f, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x1f, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x1f, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x0f, 0xff,
+    0xff, 0xff, 0xff, 0xf8, 0x07, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x07, 0xff, 0xff, 0xff, 0xff, 0xf8, 0x07, 0xff,
+    0xff, 0xff, 0xff, 0xf8, 0x07, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x0f, 0xff, 0xff, 0xff, 0xff, 0xfe, 0x1f, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+    0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff};

src/images/MoonIcon.h

@@ -0,0 +1,24 @@
+#pragma once
+#include <cstdint>
+
+// Image dimensions: 48x48
+#define MOONICON_WIDTH 48
+#define MOONICON_HEIGHT 48
+
+static const uint8_t MoonIcon[] = {
+    0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+    0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xF7, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xE7, 0xFF, 0xFF, 0xFF,
+    0xFF, 0xFF, 0xE7, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x80, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0xFF, 0xFF, 0xFF,
+    0xFF, 0xFF, 0xE7, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xE7, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xF7, 0xFF, 0xFF, 0xFF,
+    0xFF, 0xFB, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xF9, 0xFF, 0xF7, 0xFF, 0xFF, 0xFF, 0xF9, 0xFF, 0xF0, 0xFF, 0xFF,
+    0xFF, 0xC0, 0x1F, 0xF0, 0x3F, 0xFF, 0xFF, 0x00, 0x1F, 0xF8, 0x0F, 0xFF, 0xFF, 0xF0, 0x7F, 0xFC, 0x07, 0xFF,
+    0xFF, 0xF9, 0xFF, 0xFC, 0x07, 0xFF, 0xFF, 0xF9, 0xFF, 0xFC, 0x03, 0xFF, 0xFF, 0xF9, 0xFF, 0xFE, 0x01, 0xFF,
+    0xFF, 0xFF, 0xFF, 0xFE, 0x01, 0xFF, 0xFF, 0xFF, 0xFF, 0xFE, 0x01, 0xFF, 0xFF, 0xFF, 0xFF, 0xFE, 0x00, 0xFF,
+    0xFF, 0xFF, 0xFF, 0xFE, 0x00, 0xFF, 0xFF, 0xEF, 0xFF, 0xFC, 0x00, 0xFF, 0xFF, 0xEF, 0xFF, 0xFC, 0x00, 0xFF,
+    0xFF, 0xC7, 0xFF, 0xF8, 0x00, 0xFF, 0xFF, 0xC3, 0xFF, 0xF8, 0x00, 0x7F, 0xFF, 0xC3, 0xFF, 0xF0, 0x00, 0x7F,
+    0xFF, 0xC1, 0xFF, 0xC0, 0x00, 0x7F, 0xFF, 0xC0, 0x7F, 0x00, 0x00, 0x7F, 0xFF, 0xC0, 0x00, 0x00, 0x00, 0xFF,
+    0xFF, 0xC0, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xE0, 0x00, 0x00, 0x01, 0xFF, 0xFF, 0xE0, 0x00, 0x00, 0x03, 0xFF,
+    0xFF, 0xF0, 0x00, 0x00, 0x03, 0xFF, 0xFF, 0xF8, 0x00, 0x00, 0x07, 0xFF, 0xFF, 0xFC, 0x00, 0x00, 0x0F, 0xFF,
+    0xFF, 0xFE, 0x00, 0x00, 0x1F, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x3F, 0xFF, 0xFF, 0xFF, 0xC0, 0x00, 0x7F, 0xFF,
+    0xFF, 0xFF, 0xF0, 0x01, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
+    0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};

src/main.cpp

@@ -30,6 +30,7 @@
 #include "activities/settings/SdFirmwareUpdateActivity.h"
 #include "components/UITheme.h"
 #include "fontIds.h"
+#include "images/LoadingIcon.h"
 #include "util/ButtonNavigator.h"
 #include "util/ScreenshotUtil.h"
 
@@ -39,6 +40,7 @@ ActivityManager activityManager(renderer, mappedInputManager);
 FontDecompressor fontDecompressor;
 SdCardFontSystem sdFontSystem;
 FontCacheManager fontCacheManager(renderer.getFontMap(), renderer.getSdCardFonts());
+static unsigned long allowSleepAt = 0;
 
 // Fonts
 EpdFont notoserif14RegularFont(&notoserif_14_regular);
@@ -207,13 +209,46 @@ void waitForPowerRelease() {
   }
 }
 
+constexpr char SLEEP_FRAME_FILE[] = "/.crosspoint/sleep_frame.bin";
+
+static void saveSleepFrameBuffer() {
+  FsFile file;
+  if (!Storage.openFileForWrite("SLP", SLEEP_FRAME_FILE, file)) return;
+  file.write(renderer.getFrameBuffer(), renderer.getBufferSize());
+  file.close();
+}
+
+static bool loadSleepFrameBuffer() {
+  FsFile file;
+  if (!Storage.openFileForRead("SLP", SLEEP_FRAME_FILE, file)) return false;
+  const size_t bufferSize = display.getBufferSize();
+  const size_t bytesRead = file.read(display.getFrameBuffer(), bufferSize);
+  file.close();
+  if (bytesRead != bufferSize) {
+    Storage.remove(SLEEP_FRAME_FILE);
+    return false;
+  }
+  Storage.remove(SLEEP_FRAME_FILE);
+  return true;
+}
+
 // Enter deep sleep mode
-void enterDeepSleep() {
+void enterDeepSleep(bool fromTimeout = false) {
   HalPowerManager::Lock powerLock;  // Ensure we are at normal CPU frequency for sleep preparation
   APP_STATE.lastSleepFromReader = activityManager.isReaderActivity();
+
+  const bool isSeamless = SETTINGS.seamlessSleepScreen == CrossPointSettings::SEAMLESS_SLEEP_SCREEN::SEAMLESS_ALWAYS ||
+                          (fromTimeout && SETTINGS.seamlessSleepScreen ==
+                                              CrossPointSettings::SEAMLESS_SLEEP_SCREEN::SEAMLESS_AFTER_TIMEOUT);
+  APP_STATE.showBootScreen = !isSeamless;
+
   APP_STATE.saveToFile();
 
-  activityManager.goToSleep();
+  activityManager.goToSleep(fromTimeout);
+
+  if (isSeamless) {
+    saveSleepFrameBuffer();
+  }
 
   // Tear down WiFi so the modem power domain isn't held alive across deep sleep.
   // Wake from deep sleep is effectively a chip reset, so no state needs to survive.
@@ -229,8 +264,8 @@ void enterDeepSleep() {
   powerManager.startDeepSleep(gpio);
 }
 
-void setupDisplayAndFonts() {
-  display.begin();
+void setupDisplayAndFonts(bool seamless = false) {
+  display.begin(seamless);
   renderer.begin();
   activityManager.begin();
   LOG_DBG("MAIN", "Display initialized");
@@ -313,6 +348,8 @@ void setup() {
   HalSystem::checkPanic();
 
   SETTINGS.loadFromFile();
+  APP_STATE.loadFromFile();
+  RECENT_BOOKS.loadFromFile();
   I18N.setLanguage(static_cast<Language>(SETTINGS.language));
   KOREADER_STORE.loadFromFile();
   OPDS_STORE.loadFromFile();
@@ -360,17 +397,28 @@ void setup() {
   // First serial output only here to avoid timing inconsistencies for power button press duration verification
   LOG_DBG("MAIN", "Starting CrossPoint version " CROSSPOINT_VERSION);
 
-  setupDisplayAndFonts();
+  setupDisplayAndFonts(/*seamless=*/!APP_STATE.showBootScreen);
 
   // First paint after silent reboot is HALF_REFRESH (SDK forces it after begin()'s
   // panel reset); subsequent paints FAST.
   if (!isSilentReboot) {
-    activityManager.goToBoot();
+    if (APP_STATE.showBootScreen) {
+      activityManager.goToBoot();
+    } else if (loadSleepFrameBuffer()) {
+      // Seamless wake: buffer restored, replace moon icon with loading icon
+      const auto pageHeight = renderer.getScreenHeight();
+      renderer.drawImage(LoadingIcon, 0, pageHeight - LOADINGICON_HEIGHT, LOADINGICON_WIDTH, LOADINGICON_HEIGHT);
+      renderer.displayBuffer(HalDisplay::HALF_REFRESH);
+      APP_STATE.showBootScreen = true;
+      APP_STATE.saveToFile();
+    } else {
+      // Frame buffer file missing — fall back to normal boot screen
+      APP_STATE.showBootScreen = true;
+      APP_STATE.saveToFile();
+      activityManager.goToBoot();
+    }
   }
 
-  APP_STATE.loadFromFile();
-  RECENT_BOOKS.loadFromFile();
-
   if (recoveryFirmwareMode) {
     // Skip normal home/reader routing: jump straight into the SD firmware picker.
     activityManager.replaceActivity(
@@ -401,6 +449,7 @@ void setup() {
 
   // Ensure we're not still holding the power button before leaving setup
   waitForPowerRelease();
+  allowSleepAt = millis() + 2000;
 }
 
 void loop() {
@@ -471,12 +520,13 @@ void loop() {
   const unsigned long sleepTimeoutMs = SETTINGS.getSleepTimeoutMs();
   if (millis() - lastActivityTime >= sleepTimeoutMs) {
     LOG_DBG("SLP", "Auto-sleep triggered after %lu ms of inactivity", sleepTimeoutMs);
-    enterDeepSleep();
+    enterDeepSleep(true);
     // This should never be hit as `enterDeepSleep` calls esp_deep_sleep_start
     return;
   }
 
-  if (gpio.isPressed(HalGPIO::BTN_POWER) && gpio.getPowerButtonHeldTime() > SETTINGS.getPowerButtonDuration()) {
+  if (millis() >= allowSleepAt && gpio.isPressed(HalGPIO::BTN_POWER) &&
+      gpio.getPowerButtonHeldTime() > SETTINGS.getPowerButtonDuration()) {
     // If the screenshot combination is potentially being pressed, don't sleep
     if (gpio.isPressed(HalGPIO::BTN_DOWN)) {
       return;