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Demographic information.
| Variable | M (SD) | Range |
| Sleep duration (h) | 8.08 (0.45) | 7.35–9.52 |
| Pre-study bedtime | 22:36 (0:52) | 21:04–01:57 |
| Pre-study waketime | 06:41 (1:00) | 05:06–10:34 |
| PSQI | 2.78 (1.64) | 0.00–5.00 |
| MEQ | 53.39 (6.16) | 43.00–61.00 |
Sleep duration was calculated using the sleep diary. M, mean; SD, standard deviation; h, hours; PSQI, Pittsburgh Sleep Quality Index; MEQ, Morningness-Eveningness Questionnaire.
