Lullaby#

Falling asleep can sometimes be the hardest part of the night. Sleep as Android includes a versatile Lullaby Engine designed to soothe your mind and help you drift off effortlessly.

Whether you prefer calming nature soundscapes, binaural beats, guided meditations, custom playlists, or streaming online radio, the app provides a customizable audio experience that automatically fades away once you fall asleep.

Accessing Lullabies#

You can choose, customize, and start lullabies from three places in the app:

  • General Settings: Go to Settings → Sleep tracking → Lullabies.
  • Left Navigation Menu: Tap Left ≡ Menu → Lullabies to pick tracks or playlists.
  • Sleep Tracking Screen: Tap the ic_action_lullaby Lullaby icon directly on the tracking screen to toggle or choose music.

Built-In Nature & Ambient Sounds#

Built-in lullabies blend repetitive background sounds with gentle, subtle accents to relax your brain without causing overstimulation.

  • Included Free: Whale Diving, Thunderstorm, Mountain Stream, White Noise, Down in a Cave, Fireplace, Ocean Beach, Windy Walk, Old Clock, and Chants of Tibet.
  • Additional Add-ons: Dozens of extra soundscapes (such as Summer Night, Frogs in Pond, Mediavel Tavern, Cat Purr, Steam Train, NASA Saturn “Space Ship, Solfeggio, ASMR and many more) are available through the Lullaby Extension Pack or free extension pack for full Sleep as Android versions.

Custom Playlists & External Media#

  • Playlists: Combine multiple built-in tracks into a continuous rotation. The playlist will pick the lullaby based on the last used tracks and will change the melody after 10 minutes.
  • Spotify: Stream music, relaxing audio, or sleep playlists directly from your Spotify library.
  • Online Radio: Play live ambient streams (e.g., SomaFM stations included by default, or add your custom URL.
  • External Players: Use your preferred player (audiobooks, podcasts, YouTube Music) alongside Sleep as Android with Turn off when sleeping feature.

Guided Meditation#

Incorporate text-to-speech guided meditations directly into your bedtime routine.

  • Includes built-in templates like Fall Asleep Meditation, Daytime Relaxation, and Breathing Exercises.
  • Allows customization of voice parameters, pitch, speed, and language.

💡 Note: This feature requires Lis10 companion app installed.

Binaural Beats#

Generates real-time acoustic tones in the Delta (down to 2 Hz) or Theta (down to 4 Hz) frequency ranges to encourage deep relaxation and sleep readiness.

⚠️ Safety Warning: Binaural beats require headphones to be effective. Do not use binaural beats if you suffer from cardiac or epileptic conditions.

Lullaby Frequencies (Relaxation & Sleep)#

When enabled in lullabies, binaural tones help slow down brainwave frequency to promote deep sleep:

  • Delta Waves: Frequency goes down to 2 Hz (associated with deep, dreamless sleep).
  • Theta Waves: Frequency goes down to 4 Hz (associated with light sleep, deep relaxation, and REM).

Binaural Beats in Alarms (Wake-Up Activation)#

You can also configure stimulating binaural beats into your alarm sound to boost morning alertness:

  • Beta Waves: Frequency around 20 Hz (promotes active, analytical thinking and focus).
  • Gamma Waves: Frequency around 40 Hz (promotes high-level cognitive processing and peak awareness).

Additional Binaural Settings#

  • Volume: Independently set the volume level of binaural tones relative to the background lullaby.
  • Mindroid: Integration with the Mindroid app visual/auditory stimulation system for deeper entrainment.

Key Settings & Features#

Setting Description
Turn Off When Sleeping Monitors your sleep state and gradually fades the audio volume to zero as you drift off. Works with built-in lullabies and external apps (Spotify, audiobooks, etc.).
Start Automatically Starts playing your selected lullaby as soon as you initiate sleep tracking.
Timeout Plays each track in a playlist for a set duration before switching to the next.
Volume & Sudden sounds Level Separately adjust the master lullaby volume and the volume of sudden sound accents (like thunder or bubbles).

How-To Guides#

How to Set Up Spotify Lullabies #

  1. Configure Spotify Connection: Go to Settings → Services → Spotify and authorize Sleep as Android to link with your Spotify account. (For detailed integration instructions, see our /services/spotify#spotify_set_up guide).
  2. Select Spotify Lullaby: Open Left ≡ Menu → Lullabies and switch to the Spotify tab.
  3. Pick Your Playlist: Browse your saved playlists or albums and tap to select the one you want to play at bedtime.

How to Play Your Own Music/Audiobooks #

  1. Enable Settings → Sleep tracking → Lullabies → Turn off when sleeping and set a minimum playback duration (e.g., 15-30 minutes).
  2. Open your preferred app (Audible, Spotify, Podcast app) and start playback.
  3. Start Sleep Tracking in Sleep as Android.
  4. Once the app detects you have fallen asleep, it will automatically lower the media volume gradually.

How to Add a Custom Online Radio Stream #

  1. Go to Left ≡ Menu → Lullabies and select the Radio tab.
  2. Tap the + (Add) icon.
  3. Enter the radio station name and paste the direct audio stream URL.
  4. Tap Add to save your station.

❓ FAQs & Troubleshooting#

Why does the volume drop soon after I start tracking?

If your lullaby or external audio volume drops unexpectedly soon after starting tracking, check the following potential causes:

  1. “Turn Off When Sleeping” is enabled: Sleep as Android lowers system-wide media volume when it senses you’re falling asleep. Go to Settings → Sleep tracking → Lullabies → Turn off when sleeping and increase the minimum playback duration (e.g., 20-30 minutes) or set it to disabled.
  2. System Do Not Disturb (DND) or Bedtime/Sleep Mode blocking media: Your phone’s system settings (Android DND, Digital Wellbeing, or Samsung Sleep Mode) might be configured to mute media audio when tracking begins. Check your device’s Do Not Disturb or Modes & Routines to ensure media playback is allowed while DND or Sleep Mode is active.
Can I use binaural beats through phone speakers?

No. Binaural beats work by sending slightly different frequencies to each ear, which requires stereo headphones or earbuds to produce the desired brainwave effect.

Why did my lullaby stop playing suddenly during the night?

If your lullaby stopped unexpectedly during the night, it is usually due to Android background restrictions:

  • Battery Optimization: System-level battery optimization terminated the app’s background process overnight.
  • Intentional Safety Behavior: Even when Sleep as Android recovers and resumes sleep tracking automatically, the app intentionally does not restart lullaby audio. This prevents sudden music or audio from startling or waking you up while sleeping.
  • 👉 Fix: Exclude Sleep as Android from battery optimization. Visit DontKillMyApp.com for step-by-step instructions for your phone model.

Need further help? Contact us via Left ☰ Menu → Support → Report a bug.

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