Table 1. Polysomnographic data of the first and second night (means ± standard deviations).
| Night 1 | Night 2 | |
| Total sleep time (min) | 379.1±56.2 | 416.3±24.0 |
| Sleep efficiency (%) | 80.2±10.0 | 86.7±5.0 |
| Sleep onset latency (min) | 20.7±19.0 | 17.8±16.5 |
| Sleep period time (min) | 446.0±46.7 | 457.9±22.5 |
| Number of awakenings | 38.0±15.8 | 35.4±13.7 |
| Wake after sleep onset (min) | 66.8±40.2 | 41.6±16.8 |
| Arousal index (h−1) | 16.9±6.1 | 14.2±5.7 |
| Stage 1 (% SPT) | 11.3±5.2 | 8.7±4.5 |
| Stage 2 (% SPT) | 49.9±8.7 | 53.8±5.9 |
| SWS (% SPT) | 6.8±6.6 | 8.9±7.2 |
| REM (% SPT) | 17.1±5.1 | 19.5±3.8 |
| Leg movements (during TST) | 39.1±34.6 | - |
| Leg movements with arousal (during TST) | 4.9±7.7 | - |
| PLMS (during TST) | 14.4±21.9 | - |
| PLMS with arousal (during TST) | 2.3±4.8 | - |
| PLMS index (h−1 TST) | 2.4±3.7 | - |
| PLMS index with arousal (h−1 TST) | 0.4±0.8 | - |
| Apnea hypopnea index (h−1 TST) | 3.6±4.0 | - |
| Sleep apnea index (h−1 TST) | 0.4±0.7 | - |
SPT: sleep period time; SWS: slow wave sleep; REM: rapid eye movement sleep; PLMS: periodic leg movements during sleep; TST: total sleep time.