I've used Sleep as Android for several years. It does a great job of determining when I'm asleep and awake and even offers recommendations based on the data it collects.
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It is very hard to do that accurately. Fitness watches use accelerometers to detect body movement, pulse measurement etc. and still aren't great. Real monitoring uses a lot more instruments including EEG. If you think you might need that, ask your Dr about a sleep study.
I have a cheap smartwatch (amazfit bip) that tracks sleep and I have found it to be very accurate for me. I assume it tracks when I fall asleep based on heart rate and movement?
Anyways it plays nicely with my android phone and only cost about $50 and honestly I'm pretty happy with it! I was pretty skeptical at first but it's really handy as a fitness tracker too and I feel like it encourages me to stand up and exercise more.
I also have a somewhat erratic sleep schedule and it's nice to know when I'm starting to get into a sleep deficit and need to get caught up.
I have a Bip as well, and aside from the silly name I love it. Even after 5 years a single charge lasts more than a month.
It tracks my sleep and steps, and is always on (other smartwatches turn the display off to save the battery).
It doesn't do all the fanciest things. I can't answer phone calls or send text messages (it will display received messages), but the advantages far away the drawbacks.