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I just got a Misfit Ray as a prize for a walking at work challenge. I'm going to give it to my son since I already have a Fitbit HR something or other.
I like my Fitbit. No idea how accurate it is at tracking sleep. How would I know? But it is consistent with what it says about my sleep, so I tend to think it's correct.
There are some times that I am lying still for an hour or more, hoping to fall back asleep, and it counts that as sleeping. It's good at tracking tossing and turning and deciding whether I am sleeping or not.
The HR sensor can tell a lot from your heart rate.
It uses light to sense your HR and sometimes that startles me a little if I shift position at night and a gap between the device and my wrist is exposed and light leaks out.
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