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Sleep As Android

I don't think it will directly track leg movement, but it tracks sounds, so if you're shuffling the sheets it could possibly pick that up. It's a very highly rated app and I've used it successfully myself.

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It also works with a bunch of smart watches[1]. I use a Android WearOS Fossil watch, connect it to Sleep as Android, and then it'll use my watch movements to track my sleep. The Smart Alarm to wake me a little early if I'm almost awake is a godsend. This is a quick list of compatible devices, but any WearOS device should work.

https://docs.sleep.urbandroid.org/devices/wearables.html

These types of apps are great in my experience... unless you use a white noise maker or a fan.

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