Actigraphy sleep variables of swimmers during the training and rest days
| Training days (n=20) | Rest days (n=20) | P value | |
| Going to bed time (hh:mm) | 23:07 (±01:16) | 23:16 (±01:34) | NS* |
| Out of bed time (hh:mm) | 06:22 (±00:51) | 08:55 (±01:02) | <0.001* |
| Time in bed (h) | 7.3 (±1.3) | 9.7 (±2.0) | 0.002* |
| Falling asleep within 30 min (n, %) | 4 (20%) | 2 (10%) | <0.001† |
| Sleep efficiency (%) | 91% (±9.21) | 90% (±9.46) | NS† |
| Total sleep time (h) | 6.6 (±1.2) | 8.7 (±1.5) | <0.001* |
| Sleep onset latency (min) | 18.3 (±13.1) | 19.1 (±11.9) | NS* |
| WASO episodes (%) | 5.9 (±1.1) | 6.7 (±1.9) | NS† |
| WASO duration (min) | 13.1 (±11.8) | 16.6 (±12.5) | NS* |
*P value: paired t-test analysis.
†χ value: χ2 analysis.
NS, non-significant; WASO, wake time after sleep onset.