Table 2. Descriptive statistics of all sleep parameters of interest. n M SD Sleep Quantity     Total Sleep Time (h:min) 282 7:30 1:05     Sleep Onset Latency (h:min) 282 0:14 0:17     Wake After Sleep Onset (h:min) 282 0:31 0:16     Sleep Efficiency (%) 282 88.73 5.55 Sleep Stages     Light (h:min) 206 3:54 0:50     Deep (h:min) 206 1:37 0:31     REM (h:min) 206 1:59 0:42