This app was mentioned in 5 comments, with an average of 1.40 upvotes
Thanks. I couldn't find one by Google... Maybe this on a galaxy gear: https://play.google.com/store/apps/details?id=ch.pete.wakeupwell&hl=en&referrer=utm_source%3Dgoogle%26utm_medium%3Dorganic%26utm_term%3Dgoogle+app+detects+wakes+up+vibrates&pcampaignid=APPU_1_IeJ5V5aLD8bG0gTppK_4CQ
unfortunately there are no alternatives. If you need a smart alarm clock, that is, here it is https://play.google.com/store/apps/details?id=ch.pete.wakeupwell
Sleep as Android tends to drain the battery an enormous amount as it maintains in constant Bluetooth communication to the phone overnight. It has a lot of features though.
If you want something simple that doesn't drain the battery and doesn't require a phone connection, I use and quite like Wake Up Well. It just functions as a waking window alarm clock. I use this since my watch has built in general sleep tracking.
Another option is Smart Alarm and Sleep Tracker for Wear OS which does on device sleep tracking but the interface is a little cumbersome.
There's also Sleep Cycle, which is more like Sleep as Android. I haven't tried that one.
Here's the link to Wake up Well that I mentioned previously https://play.google.com/store/apps/details?id=ch.pete.wakeupwell
I was looking for a solution and here are my findings.
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Option 1: Wearable only.
You add the smart alarm from the tracker/watch itself, if it has a screen, OR you use a mobile application to add the alarm and no further bluetooth connection is needed.
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Option 2: Wearable + bluetooth Connection + Mobile
You run an application on your mobile which is connected to your tracker/watch via bluetooth during your sleep.
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Option 3: Bed relatedٍ
You place a mobile/special sleep device above/under your mattress OR you place mobile/special sleep device next to your bed