diff --git a/lib/Epub/Epub.cpp b/lib/Epub/Epub.cpp
index 4040191..1477d72 100644
--- a/lib/Epub/Epub.cpp
+++ b/lib/Epub/Epub.cpp
@@ -154,47 +154,46 @@ bool Epub::load() {
   return true;
 }
 
-void Epub::initializeSpineItemSizes(){
+void Epub::initializeSpineItemSizes() {
+  setupCacheDir();
 
-    setupCacheDir();
-
-    size_t spineItemsCount = getSpineItemsCount();
-    size_t cumSpineItemSize = 0;
-    if (SD.exists((getCachePath() + "/spine_size.bin").c_str())) {
-      File f = SD.open((getCachePath() + "/spine_size.bin").c_str());
-      uint8_t data[4];
-      for (size_t i = 0; i < spineItemsCount; i++) {
-        f.read(data, 4);
-        cumSpineItemSize  = data[0] | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
-        cumulativeSpineItemSize.emplace_back(cumSpineItemSize);
-        // Serial.printf("[%lu] [EBP] Loading item %d size %u to %u %u\n", millis(),
-        //     i, cumSpineItemSize, data[1], data[0]);
-      }
-      f.close();
-    } else {
-        File f = SD.open((getCachePath() + "/spine_size.bin").c_str(), FILE_WRITE);
-        uint8_t data[4];
-        // determine size of spine items
-        for (size_t i = 0; i < spineItemsCount; i++) {
-          std::string spineItem = getSpineItem(i);
-          size_t s = 0;
-          getItemSize(spineItem, &s);
-          cumSpineItemSize += s;
-          cumulativeSpineItemSize.emplace_back(cumSpineItemSize);
-
-          // and persist to cache
-          data[0] = cumSpineItemSize & 0xFF;
-          data[1] = (cumSpineItemSize >> 8) & 0xFF;
-          data[2] = (cumSpineItemSize >> 16) & 0xFF;
-          data[3] = (cumSpineItemSize >> 24) & 0xFF;
-          // Serial.printf("[%lu] [EBP] Persisting item %d size %u to %u %u\n", millis(),
-          //     i, cumSpineItemSize, data[1], data[0]);
-          f.write(data, 4);
-        }
-
-        f.close();
+  size_t spineItemsCount = getSpineItemsCount();
+  size_t cumSpineItemSize = 0;
+  if (SD.exists((getCachePath() + "/spine_size.bin").c_str())) {
+    File f = SD.open((getCachePath() + "/spine_size.bin").c_str());
+    uint8_t data[4];
+    for (size_t i = 0; i < spineItemsCount; i++) {
+      f.read(data, 4);
+      cumSpineItemSize = data[0] | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
+      cumulativeSpineItemSize.emplace_back(cumSpineItemSize);
+      // Serial.printf("[%lu] [EBP] Loading item %d size %u to %u %u\n", millis(),
+      //     i, cumSpineItemSize, data[1], data[0]);
     }
-    Serial.printf("[%lu] [EBP] Book size: %lu\n", millis(), cumSpineItemSize);
+    f.close();
+  } else {
+    File f = SD.open((getCachePath() + "/spine_size.bin").c_str(), FILE_WRITE);
+    uint8_t data[4];
+    // determine size of spine items
+    for (size_t i = 0; i < spineItemsCount; i++) {
+      std::string spineItem = getSpineItem(i);
+      size_t s = 0;
+      getItemSize(spineItem, &s);
+      cumSpineItemSize += s;
+      cumulativeSpineItemSize.emplace_back(cumSpineItemSize);
+
+      // and persist to cache
+      data[0] = cumSpineItemSize & 0xFF;
+      data[1] = (cumSpineItemSize >> 8) & 0xFF;
+      data[2] = (cumSpineItemSize >> 16) & 0xFF;
+      data[3] = (cumSpineItemSize >> 24) & 0xFF;
+      // Serial.printf("[%lu] [EBP] Persisting item %d size %u to %u %u\n", millis(),
+      //     i, cumSpineItemSize, data[1], data[0]);
+      f.write(data, 4);
+    }
+
+    f.close();
+  }
+  Serial.printf("[%lu] [EBP] Book size: %lu\n", millis(), cumSpineItemSize);
 }
 
 bool Epub::clearCache() const {
diff --git a/src/main.cpp b/src/main.cpp
index 39c5bd0..d12c701 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -216,7 +216,7 @@ void loop() {
     return;
   }
 
-  if (inputManager.wasReleased(InputManager::BTN_POWER) && inputManager.getHeldTime() > POWER_BUTTON_WAKEUP_MS) {
+  if (inputManager.wasReleased(InputManager::BTN_POWER) && inputManager.getHeldTime() > POWER_BUTTON_SLEEP_MS) {
     enterDeepSleep();
     // This should never be hit as `enterDeepSleep` calls esp_deep_sleep_start
     return;