diff --git a/android/app/src/main/java/com/audiobookshelf/app/data/DeviceClasses.kt b/android/app/src/main/java/com/audiobookshelf/app/data/DeviceClasses.kt
index 40763a67..6358ea2c 100644
--- a/android/app/src/main/java/com/audiobookshelf/app/data/DeviceClasses.kt
+++ b/android/app/src/main/java/com/audiobookshelf/app/data/DeviceClasses.kt
@@ -135,6 +135,7 @@ data class DeviceSettings(
   var sleepTimerLength: Long, // Time in milliseconds
   var disableSleepTimerFadeOut: Boolean,
   var disableSleepTimerResetFeedback: Boolean,
+  var enableSleepTimerAlmostDoneChime: Boolean,
   var languageCode: String,
   var downloadUsingCellular: DownloadUsingCellularSetting,
   var streamingUsingCellular: StreamingUsingCellularSetting,
@@ -163,6 +164,7 @@ data class DeviceSettings(
         autoSleepTimerAutoRewindTime = 300000L, // 5 minutes
         disableSleepTimerFadeOut = false,
         disableSleepTimerResetFeedback = false,
+        enableSleepTimerAlmostDoneChime = false,
         languageCode = "en-us",
         downloadUsingCellular = DownloadUsingCellularSetting.ALWAYS,
         streamingUsingCellular = StreamingUsingCellularSetting.ALWAYS,
@@ -188,9 +190,9 @@ data class DeviceSettings(
 
   @JsonIgnore
   fun getShakeThresholdGravity() : Float { // Used in ShakeDetector
-    return if (shakeSensitivity == ShakeSensitivitySetting.VERY_HIGH) 1.2f
-    else if (shakeSensitivity == ShakeSensitivitySetting.HIGH) 1.4f
-    else if (shakeSensitivity == ShakeSensitivitySetting.MEDIUM) 1.6f
+    return if (shakeSensitivity == ShakeSensitivitySetting.VERY_HIGH) 1.1f
+    else if (shakeSensitivity == ShakeSensitivitySetting.HIGH) 1.3f
+    else if (shakeSensitivity == ShakeSensitivitySetting.MEDIUM) 1.5f
     else if (shakeSensitivity == ShakeSensitivitySetting.LOW) 2f
     else if (shakeSensitivity == ShakeSensitivitySetting.VERY_LOW) 2.7f
     else {
diff --git a/android/app/src/main/java/com/audiobookshelf/app/device/DeviceManager.kt b/android/app/src/main/java/com/audiobookshelf/app/device/DeviceManager.kt
index 2ba28d05..d31891ff 100644
--- a/android/app/src/main/java/com/audiobookshelf/app/device/DeviceManager.kt
+++ b/android/app/src/main/java/com/audiobookshelf/app/device/DeviceManager.kt
@@ -64,6 +64,10 @@ object DeviceManager {
     if (deviceData.deviceSettings?.autoSleepTimerAutoRewindTime == null) {
       deviceData.deviceSettings?.autoSleepTimerAutoRewindTime = 300000L // 5 minutes
     }
+    // Initialize sleep timer almost done chime added in v0.9.81
+    if (deviceData.deviceSettings?.enableSleepTimerAlmostDoneChime == null) {
+      deviceData.deviceSettings?.enableSleepTimerAlmostDoneChime = false
+    }
 
     // Language added in v0.9.69
     if (deviceData.deviceSettings?.languageCode == null) {
diff --git a/android/app/src/main/java/com/audiobookshelf/app/managers/SleepTimerManager.kt b/android/app/src/main/java/com/audiobookshelf/app/managers/SleepTimerManager.kt
index c7b7aaa4..263a243e 100644
--- a/android/app/src/main/java/com/audiobookshelf/app/managers/SleepTimerManager.kt
+++ b/android/app/src/main/java/com/audiobookshelf/app/managers/SleepTimerManager.kt
@@ -1,15 +1,20 @@
 package com.audiobookshelf.app.managers
 
 import android.content.Context
+import android.media.MediaPlayer
 import android.os.*
 import android.util.Log
+import com.audiobookshelf.app.R
 import com.audiobookshelf.app.device.DeviceManager
 import com.audiobookshelf.app.player.PlayerNotificationService
 import com.audiobookshelf.app.player.SLEEP_TIMER_WAKE_UP_EXPIRATION
+import com.audiobookshelf.app.plugins.AbsLogger
 import java.util.*
 import kotlin.concurrent.schedule
 import kotlin.math.roundToInt
 
+const val SLEEP_TIMER_CHIME_SOUND_VOLUME = 0.7f
+
 class SleepTimerManager
 constructor(private val playerNotificationService: PlayerNotificationService) {
   private val tag = "SleepTimerManager"
@@ -156,6 +161,10 @@ constructor(private val playerNotificationService: PlayerNotificationService) {
                     )
                   }
 
+                  if (sleepTimeSecondsRemaining == 30 && sleepTimerElapsed > 1 && DeviceManager.deviceData.deviceSettings?.enableSleepTimerAlmostDoneChime == true) {
+                    playChimeSound()
+                  }
+
                   if (sleepTimeSecondsRemaining <= 0) {
                     Log.d(tag, "Sleep Timer Pausing Player on Chapter")
                     pause()
@@ -263,6 +272,19 @@ constructor(private val playerNotificationService: PlayerNotificationService) {
     }
   }
 
+  /** Plays chime sound */
+  private fun playChimeSound() {
+    AbsLogger.info(tag, "playChimeSound: Playing sleep timer chime sound")
+    val ctx = playerNotificationService.getContext()
+    val mediaPlayer = MediaPlayer.create(ctx, R.raw.bell)
+    mediaPlayer.setVolume(SLEEP_TIMER_CHIME_SOUND_VOLUME, SLEEP_TIMER_CHIME_SOUND_VOLUME)
+    mediaPlayer.start()
+    mediaPlayer.setOnCompletionListener {
+      AbsLogger.info(tag, "playChimeSound: Releasing mediaPlayer after chime sound")
+      mediaPlayer.release()
+    }
+  }
+
   /**
    * Gets the chapter end time for use in End of Chapter timers. If less than 10 seconds remain in
    * the chapter, then use the next chapter.
diff --git a/android/app/src/main/java/com/audiobookshelf/app/player/ShakeDetector.kt b/android/app/src/main/java/com/audiobookshelf/app/player/ShakeDetector.kt
index 331543db..d25206d1 100644
--- a/android/app/src/main/java/com/audiobookshelf/app/player/ShakeDetector.kt
+++ b/android/app/src/main/java/com/audiobookshelf/app/player/ShakeDetector.kt
@@ -5,6 +5,7 @@ import android.hardware.SensorEvent
 import android.hardware.SensorEventListener
 import android.hardware.SensorManager
 import com.audiobookshelf.app.device.DeviceManager
+import com.audiobookshelf.app.plugins.AbsLogger
 import kotlin.math.sqrt
 
 class ShakeDetector : SensorEventListener {
@@ -46,6 +47,7 @@ class ShakeDetector : SensorEventListener {
         if (mShakeTimestamp + SHAKE_COUNT_RESET_TIME_MS < now) {
           mShakeCount = 0
         }
+        AbsLogger.info("ShakeDetector", "Device shake above threshold ($gForce > $shakeThreshold)")
         mShakeTimestamp = now
         mShakeCount++
         mListener!!.onShake(mShakeCount)
diff --git a/android/app/src/main/res/raw/bell.mp3 b/android/app/src/main/res/raw/bell.mp3
new file mode 100644
index 00000000..c14bd84f
Binary files /dev/null and b/android/app/src/main/res/raw/bell.mp3 differ
diff --git a/pages/settings.vue b/pages/settings.vue
index 5c3c75ae..660d6a6a 100644
--- a/pages/settings.vue
+++ b/pages/settings.vue
@@ -100,6 +100,13 @@
         <p class="pl-4">{{ $strings.LabelDisableVibrateOnReset }}</p>
         <span class="material-symbols text-xl ml-2" @click.stop="showInfo('disableSleepTimerResetFeedback')">info</span>
       </div>
+      <div class="flex items-center py-3">
+        <div class="w-10 flex justify-center" @click="toggleSleepTimerAlmostDoneChime">
+          <ui-toggle-switch v-model="settings.enableSleepTimerAlmostDoneChime" @input="saveSettings" />
+        </div>
+        <p class="pl-4">{{ $strings.LabelSleepTimerAlmostDoneChime }}</p>
+        <span class="material-symbols text-xl ml-2" @click.stop="showInfo('enableSleepTimerAlmostDoneChime')">info</span>
+      </div>
       <div class="flex items-center py-3">
         <div class="w-10 flex justify-center" @click="toggleAutoSleepTimer">
           <ui-toggle-switch v-model="settings.autoSleepTimer" @input="saveSettings" />
@@ -207,6 +214,7 @@ export default {
         sleepTimerLength: 900000, // 15 minutes
         disableSleepTimerFadeOut: false,
         disableSleepTimerResetFeedback: false,
+        enableSleepTimerAlmostDoneChime: false,
         autoSleepTimerAutoRewind: false,
         autoSleepTimerAutoRewindTime: 300000, // 5 minutes
         languageCode: 'en-us',
@@ -234,6 +242,10 @@ export default {
           name: this.$strings.LabelDisableVibrateOnReset,
           message: this.$strings.LabelDisableVibrateOnResetHelp
         },
+        enableSleepTimerAlmostDoneChime: {
+          name: this.$strings.LabelSleepTimerAlmostDoneChime,
+          message: this.$strings.LabelSleepTimerAlmostDoneChimeHelp
+        },
         autoSleepTimerAutoRewind: {
           name: this.$strings.LabelAutoSleepTimerAutoRewind,
           message: this.$strings.LabelAutoSleepTimerAutoRewindHelp
@@ -549,6 +561,10 @@ export default {
       this.settings.disableSleepTimerResetFeedback = !this.settings.disableSleepTimerResetFeedback
       this.saveSettings()
     },
+    toggleSleepTimerAlmostDoneChime() {
+      this.settings.enableSleepTimerAlmostDoneChime = !this.settings.enableSleepTimerAlmostDoneChime
+      this.saveSettings()
+    },
     toggleDisableAutoRewind() {
       this.settings.disableAutoRewind = !this.settings.disableAutoRewind
       this.saveSettings()
@@ -620,6 +636,7 @@ export default {
       this.settings.sleepTimerLength = !isNaN(deviceSettings.sleepTimerLength) ? deviceSettings.sleepTimerLength : 900000 // 15 minutes
       this.settings.disableSleepTimerFadeOut = !!deviceSettings.disableSleepTimerFadeOut
       this.settings.disableSleepTimerResetFeedback = !!deviceSettings.disableSleepTimerResetFeedback
+      this.settings.enableSleepTimerAlmostDoneChime = !!deviceSettings.enableSleepTimerAlmostDoneChime
 
       this.settings.autoSleepTimerAutoRewind = !!deviceSettings.autoSleepTimerAutoRewind
       this.settings.autoSleepTimerAutoRewindTime = !isNaN(deviceSettings.autoSleepTimerAutoRewindTime) ? deviceSettings.autoSleepTimerAutoRewindTime : 300000 // 5 minutes
diff --git a/strings/en-us.json b/strings/en-us.json
index 0330a661..25c742cd 100644
--- a/strings/en-us.json
+++ b/strings/en-us.json
@@ -241,6 +241,8 @@
   "LabelShowAll": "Show All",
   "LabelSize": "Size",
   "LabelSleepTimer": "Sleep timer",
+  "LabelSleepTimerAlmostDoneChime": "Play a chime when almost finished",
+  "LabelSleepTimerAlmostDoneChimeHelp": "Play a chime when the sleep timer has 30 seconds remaining",
   "LabelStart": "Start",
   "LabelStartTime": "Start time",
   "LabelStatsBestDay": "Best Day",