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I have a cheap Mi Band 2 and I'm impressed with how well it measures when I'm sleeping and when I'm awake. I don't know how good it is to measure deep sleep. I

by neves 7y ago

I have a cheap Mi Band 2 and I'm impressed with how well it measures when I'm sleeping and when I'm awake. I don't know how good it is to measure deep sleep. I does not pretend to measure REM. Are there any weareable device that measures it well?

rootusrootus 7y ago
I use an Apple Watch and an app called Pillow and it does a plausible job of guessing when I went to sleep and when I woke up. It also identifies light/deep sleep and REM, but I have no way of telling how accurate. It seems to detect awake periods at night as well as I can remember them. But ... I kinda assume it's a crapshoot and I use it more as a novelty and an estimate of total sleep than any kind of accurate representation of sleep cycles.