But did reading on the iPad actually change sleep quantity/quality above and beyond the timing of melatonin? It did, in three concerning ways. First, individuals lost significant amounts of REM sleep following iPad reading. Second, the research subjects felt less rested and sleepier throughout the day following iPad use at night. Third was a linger

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Instead, use an app that records the sounds you make while you sleep and plays only those sounds back to you in the morning—this does not replace a sleep study or a diagnosis by a sleep physician, but it is a good way to get started in understanding what’s going on at night. Examples include Sleep Talk Recorder for Android and Sleep Analyzer for iO

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In the last 10 years there have been mobile apps and smartwatches and bed straps that promise to capture how well we are (or aren’t) sleeping.