At this stage it's probably more common than not to have some kind of wearable tracker to track your steps, heart rate, and the one we're discussing today - sleep. 

They give you data showing how long you've slept, how much time you spent in each of the sleep stages, and some will even provide you with your heart rate variability and how much sleep you'll need based on your stats for the day. 

But are the really as useful as they seem? Or do they provide the every day person with too much insight to stress over? 

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