Table 3. Polysomnography and Perceived Sleep Quality for the Whole Night Sleep.
| Non-bathing | Bathing | |||||
|---|---|---|---|---|---|---|
| M | SD | M | SD | t | p | |
| Polysomnography a | ||||||
| Total sleep time (min) | 408.8 | 58.5 | 406.3 | 49.2 | -0.06 | .95 |
| Sleep latency (min) (to stage 1) | 11.7 | 12 | 8.6 | 5.8 | -1.22 | .28 |
| Wake after sleep onset (min) | 50.5 | 23.7 | 46.4 | 40.4 | -0.47 | .65 |
| Sleep efficiency b (%) | 84.8 | 7.1 | 86.4 | 7.8 | 0.63 | .54 |
| Sleep stages (% sleep period time c) | ||||||
| Stage 1 | 20.3 | 6.0 | 19.7 | 9.2 | -0.77 | .45 |
| Stage 2 | 49.6 | 7.4 | 47.2 | 10.1 | -0.72 | .48 |
| Stage 3 & 4 | 3.4 | 3.2 | 4.2 | 3.4 | 1.27 | .23 |
| REM | 15.7 | 3.1 | 19.0 | 4.9 | 2.43 | .03 |
| Perceived sleep | ||||||
| Total sleep time (min) | 330.0 | 58.9 | 342.0 | 89.7 | 0.28 | .78 |
| Sleep latency (min) | 34.3 | 21.0 | 29.6 | 19.0 | -1.54 | .15 |
| Number of Awakenings | 3.1 | 1.4 | 2.5 | 1.6 | -1.31 | .21 |
| Wake after sleep (min) | 63.2 | 53.7 | 25.8 | 17.9 | -1.33 | .21 |
| Sleep efficiency (%) | 71.5 | 13.6 | 74.6 | 17.8 | 0.37 | .72 |
| Perceived sleep quality | ||||||
| Morning restoration (rested-no) | 4.2 | 1.9 | 3.5 | 1.9 | -1.32 | .21 |
| Overall sleep quality (good-poor) | 4.2 | 2.0 | 3.9 | 2.6 | -0.48 | .64 |
| Sleep satisfaction (satisfied-dissatisfied) | 3.6 | 1.6 | 3.6 | 2.4 | -0.11 | .92 |
N = 15. Paired-t test, 2 tailed, with Beferroni correction alpha = .05/8=.006 for polysomnography, and for perceived sleep and sleep quality, respectively.
a
n = 14, 1 subject was excluded from whole night PSG sleep due to technical problem.
b
Sleep efficiency = total sleep time/time in bed * 100.
c
Sleep period time = total sleep time + wake after sleep onset.