Other sleep timer makes you set it every night and guess how long you'll stay awake. Forget once and your phone plays video till the battery dies. Guess wrong and it either cuts off mid-watch or burns power for hours. StillAsleep is much smarter and fixes both. Set once, it runs in the background forever. Instead of a blind countdown, it knows when you actually fall asleep — then fades the volume, pauses the video, and locks the screen. One permission. No ads. No account. No tracking. Free.