Table 4.

Sleep survey

Survey questions	Response options
How many hours did	< 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5,
you sleep last night?	8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12
Rate your overall sleep	Very bad, Fairly bad,
last night	Fairly good, Very good
How often did you have trouble	None, Once, Twice,
staying awake yesterday	Three or more times
(e.g., dozing off)?