睡眠 - Wikipedia
Hirshkowitz, Max ; Whiton, Kaitlyn et al. (14 January 2015). “National Sleep Foundation’s sleep time duration recommendations: methodology and results summary” . Sleep Health: Journal of the National Sleep Foundation (Elsevier Inc). doi : 10.1016/j.sleh.2014.12.010 . http://www.sleephealthjournal.or...
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