【模拟助眠】清洁、专注力测试、灯光测试都有，一个综合的视力检查！
Description
【模拟助眠】清洁、专注力测试、灯光测试都有，一个综合的视力检查！
Want to keep listening with the screen off?
To listen while using other apps, switch the player to Picture-in-Picture (PiP) during playback — it keeps playing in a small floating window (the screen stays on).
To listen with the screen fully off, in-browser playback stops by YouTube's design. Open the video in the YouTube app to keep listening where background playback is supported (e.g. with YouTube Premium).
Open in YouTube app
