Below provides a good overview of the importance of sleep, and in particular, slow-wave-sleep (deep sleep) and REM sleep.
The best device I have used to date for tracking not only the quantity of sleep, but also the quality of your is the WHOOP system. There are several good overviews of the WHOOP system, such as the article, Boston-based company to sell next-generation wristband to athletes.
Enjoy!
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