Table 1.

Demographic, sleep, and napping characteristics (N = 384)

Gender, (%)
Male	44.5
Female	55.2
Age, mean (SD), years	18.85 (1.49)
Race, n(%)
White	88.5
Non-white	11.5
Total sleep time, mean (SD), minutes	405.29 (40.77)
Wake after sleep onset, mean (SD), minutes	47.10 (15.77)
Sleep efficiency, mean (SD), percent	83.15 (4.72)
Sleep onset latency, mean (SD), minutes	16.47 (10.36)
Percentage of participants who napped at least once
No	19.5
Yes	80.5
Total naps taken in participants who napped at least once, mean (SD)	3.73 (2.62)
Nap duration, mean (SD), minutes	16.56 (19.41)
Nap duration on days in which nap took place, mean (SD), minutes	75.84 (48.10)
Chronotype, mean (SD)	33.34 (6.55)