The thirty participants were generally healthy, with few comorbidities and a small percentage of smokers. Data from the parent study was measured approximately 6–12 months from the interviews.
Sleep characteristics were comprised of subjective questions regarding usual hours of sleep (BRFSS questions no. 1 and 2), and daytime sleepiness (Epworth Sleepiness Scale). Objective measures from actigraphy included: sleep latency, wake after sleep onset, total sleep time, and sleep efficiency (see Table 1).