Table 1.

Self-reported sleep characteristics, collected at wave 3

	Units	Mean/median	SD/IQR	N
Quality	0–3	2.00	1.00	664
Bedtime	24-hour clock	23:00	52.09 minutes	656
Latencya	Minutes	20	20	573
Wake time	24-hour clock	07:52	53.40 minutes	654
Length night	Hours, minutes	6 hours 54 minutes	1 hour 17 minutes	653
Length daya	Minutes	10	37.5	629

^aMedian and interquartile range provided for variables that are subsequently log transformed prior to analysis, and for sleep Quality (ordinal).