Table 1.

Baseline sample demographics, N = 441.

	n (%) or M ± SD
Age at baseline, years	22.8 ± 5.0
Female	298 (68%)
Race
Black or African-American	68 (15%)
American Indian or Alaskan Native	2 (1%)
Asian	27 (6%)
White or Caucasian	320 (73%)
Native Hawaiian or other Pacific Islander	1 (0%)
Other race	23 (5%)
Body mass index (BMI)
BMI group
Normal weight	235 (53%)
Overweight	145 (33%)
Obese	61 (14%)
Employment status
Not currently working	104 (24%)
Part time, 1–19 hours per week	149 (34%)
Half time, 20–39 hours per week	145 (33%)
Full time, 40 hours per week	25 (6%)
More than full time, >40 hours per week	17 (4%)
Household income
< $12,000	292 (71%)
$12,000–$24,999	78 (19%)
$25,000–$50,000	35 (8%)
≥ $50,000	6 (2%)
Relationship status
Single, never married	240 (55%)
Unmarried, in a committed relationship	133 (30%)
Married	61 (14%)
Separated or divorced	6 (1%)
Number of children
0	324 (80%)
1	31 (8%)
2	25 (6%)
3+	25 (6%)
Study condition
Control group	217 (49%)
Intervention group	224 (51%)
Center for Epidemiologic Studies Depression Scale (CESD)	0.62 ± .44
Perceived Stress Scale	2.35 ± .66
Average hours of sleep per night	8.4 ± 1.2
Sleep deprivation (0 = 0 nights; 1 = 1–6 nights; 2 = 7–13 nights; 3 = 14–20 nights; 4 = 21–27 nights; 5 = 28–30 nights)	1.8 ± 1.1
Sleep onset insomnia
<3 nights per week, takes >30 minutes to fall asleep	314 (71%)
≥3 nights per week, takes >30 minutes to fall asleep	127 (29%)
Hypersomnia
<3 days per week, have trouble staying awake	407 (92%)
≥3 days per week, have trouble staying awake	34 (8%)