Table 1. Nocturnal sleep variables for the night before the experiments
| Variable measured (mean ± SD) |
Nap |
No-nap |
p |
Cohen’s d |
| Total time in bed (min) |
406.7 ± 71.9 |
415.2 ± 61.4 |
0.725 |
0.12 |
| Total sleep time (min) |
371.4 ± 75.0 |
379.8 ± 70.6 |
0.714 |
0.12 |
| Latency to sleep onset (m) |
24.7 ± 16.9 |
24.4 ± 16.3 |
0.958 |
0.02 |
| Wake time after sleep onset (m) |
35.6 ± 20.9 |
32.4 ± 17.6 |
0.591 |
0.15 |
| Sleep efficiency (%) |
91.0 ± 5.0 |
91.8 ± 4.9 |
0.591 |
0.17 |
No significant difference was observed in the measurement of nocturnal sleep on the day before the experiment.
