I added a dark-screen timer for rain sounds — what should happen when it ends?

I shipped a small browser feature in Yixiu because a bright player at bedtime defeats the point.

1. Start the real Window Rain recording.

2. Choose 15, 30, or 60 minutes.

3. Tap Darken Screen.

4. The open browser page turns black while the sound and timer keep running.

This is browser dark-screen mode, not physical iPhone lock-screen playback; the iPhone app is the path for background playback.

Try the live player: https://yixiu.wonderelian.com/sleep-sounds/?utm_source=producthunt&utm_medium=community_thread&utm_campaign=sleep_sounds&utm_content=dark_screen_timer_thread_01

If you use audio to sleep, what should happen when the timer ends: keep the screen black, return to the player, or something else?