Table 1.
Sample demographics, sleep hygiene, and sleep characteristics (n = 785)
| Demographics | |
| Female, N (%) | 533 (67.9%) |
| Age, mean ± SD | 63.7 ± 10.6 |
| Education, N (%) | 77 (9.8%) |
| <High school | 119 (15.2%) |
| High school or GED | 167 (21.3%) |
| Some college/training | 422 (53.8%) |
| College degree | |
| Percent days with work or school the next day (%), mean ± SD | 27.9 ± (34.2 %) |
| BMI (kg/m2), mean ± SD | 31.7 ± 6.8 |
| Current smoker, N (%) | 62 (7.9%) |
| Psychosocial factors | |
| CESD-20 score (without restless sleep item), mean ± SD | 7.7 ± 7.2 |
| High depressive symptoms (CESD-20 score without restless sleep item ≥ 16), N (%) | 108 (13.8%) |
| Trait anxiety inventory (TAI-20) score, mean ± SD | 30.4 ± 8.1 |
| Perceived stress scale (PSS-10) score, mean ± SD | 11.1 ± 6.8 |
| Moderate or high perceived stress (PSS-10 score ≥ 14), N (%) | 273 (34.8%) |
| Substance intake within 4 hours of bedtime* | |
| Percent nights had any alcoholic beverages(%), mean ± SD | 7.0 ± 17.5 |
| Percent nights had any caffeinated beverages (%), mean ± SD | 19.5 ± 29.0 |
| Percent nights smoked cigarettes (nicotine) (%), mean ± SD | 7.0 ± 23.9 |
| Sleep characteristics | |
| Actigraphy-measured sleep (daily average over all actigraphy days) | |
| Sleep duration (hours), mean ± SD | 6.7 ± 1.1 |
| WASO (minutes), mean ± SD | 53.9 ± 23.4 |
| Sleep efficiency (%), mean ± SD | 86.9 ± 4.9 |
| Insomnia Rating Scale (WHIIRS) score (n = 780), mean ± SD | 6.0 ± 5.0 |
*The distribution of substance intake is provided in Figure 1.