I thought Apple Watch was compatible with Android, just not as smooth to use. This is eye opening.<p>At the same time, though I agree Apple Watch has the best sleep tracking (and I work in the sleep space), the difference in sleep tracking compared to others probably isn't big enough to justify jumping through all these hoops, unless, like the author, you enjoy doing this sort of thing.<p>The Whoop sleep tracking is quite good, but a rather expensive (I think) subscription just to get data about a health function you have very little direct influence over.<p>The Xaoimi Bands are inexpensive, and from what I understand, also have good sleep tracking.<p>I also just came across this <a href="https://cardiomood.com/" rel="nofollow">https://cardiomood.com/</a>, which seems to be like a non-subscription, but rather expensive Whoop.