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Have you tried the Sleep Cycle app (https://www.sleepcycle.com/)? They support both iOS and Android.

Not the GP -- I've been using Sleep Cycle for exactly 852 nights. It was of immense help developing sleep hygiene. Now I'm waking up before the alarm, which I believe might make more sense if your take an evolutionary perspective. I'm still using the app, as I've wondered if I could do something interesting with this data.

It's unfortunate that Hello are shutting down. I was thinking into buying Sense for my bedroom, despite that I'm using different app, mostly because the aesthetics.

Aren't you afraid of radiation at all? I've used this app for a few months, but actually stopped because I didn't like having the device so close to my head for such a long period of time.

If you're worried, engage Airplane mode.

I'm enabling airplane mode ~30 minutes before sleep, which is part of my sleep ritual; no notifications and no radiation.

You shouldn't be. It's low power, non-ionizing radiation. It's not going to cause you any harm.

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