Quote:
Originally Posted by tranquility
I dunno why but I felt like buying one of those smartwatches that records heartbeat, # steps, when you sleep and deep sleep: if you guys can tell me how it can tell the last one, great because it's pretty neat to me.
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Depends on the watch. Some track heart rate and movement to tell where you are at in your sleep cycle and some track just one or the other of those.