90+ accuracy seems very optimistic. Still, I'd bet that whatever accuracy wearables get only work on a population, not individuals. I'm not surprised they are

90+ accuracy seems very optimistic. Still, I'd bet that whatever accuracy wearables get only work on a population, not individuals. I'm not surprised they are decent (though they can barely detect when you are sleeping...) but I don't put any faith at all on an individual basis. Given the data they can collect that is the best anyone can hope for anyway. So if you want to diagnose your own sleep, which you presumably would want to do if you are suspecting an issue, I wouldn't trust them one bit.