My question is "how does this compare to a $2 iPhone app like Sleep Cycle?"
Those apps (I assume there are clones of the one I used) measure the overall bed movement to track sleep depth, and have worked very well for me. Will wrapping something around my wrist do any better?
Those apps (I assume there are clones of the one I used) measure the overall bed movement to track sleep depth, and have worked very well for me. Will wrapping something around my wrist do any better?