`The Sad Truth About Sleep-Tracking Devices and Apps` (iPhoneBlog.de)

For the last two weeks, I´ve added an extra step to my bedtime routine: strapping a computer around my wrist. […] O.K., but what happens once you collect your sleep data from a tracker or an app? There is no real answer. My sleep-tracking statistics said I needed more sleep. (Duh.) Buried deep inside the...