Got itπ«
If you use Android, try this app.
https://play.google.com/store/apps/details?id=com.urbandroid.sleep
It can track your sleep via wearables, your phone's motion sensors, or using your phones mic and speakers as sonar. It then wakes you up during a lighter phase of sleep. It also keeps great data on your sleep. I've been using it for years, it's an app I found worth paying for π€

Discussion
The sonar feature is cool/scary. My phone sitting beside my bed can track how often I breathe per minute using audio reflections π
I always assume I'm being watched, listened to, recorded π€·
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