The sleep test also was normal, except for a delayed onset of rapid-eye-movement sleep, with unknown medical significance.

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Health apps that allow users to test their heartbeat, monitor sleep patterns and keep a check on a variety of conditions are growing in popularity.

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Warped or otherwise, I decided to give QS a three-month test drive, downloading Android apps and outfitting myself with devices to track my mood, sleep cycles, calories, location, spending and productivity.

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