This sleep tracking app is really excellent if you have an Apple Watch https://itunes.apple.com/us/app/pillow-automatic-sleep-tracker/id878691772?mt=8 …pic.twitter.com/O2QnwOA3ZR
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And when do you charge it then?
Good point, maybe the solution is to own 2 Apple watches 
True Light...or Darkness. Tough choice...Jack?
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