Table 1. An overview of demographics, PSQI, sleep duration, and sleep quality at baseline for all participants (mean ± SD).

Age (years)	22.6 (19–27)
Sex (% females)	33.3%
PSQI	5.04 ± 1.71
Sleep duration before baseline (hours)	6.85 ± 1.11
Habitual sleep duration (hours)	7.25 ± 0.69
Sleep quality before baseline (0–10)	6.92 ± 1.63
Habitual sleep quality (0–10)	7.48 ± 1.44

Data are presented as mean ± SD. PSQI, Pittsburgh Sleep Quality Index. Sleep quality was quantified on a scale from 0 to 10, in which 0 was the worst possible sleep quality and 10 was the best possible sleep quality.