Table 2.
Effect on sleep parameters of sleepwear fiber type
| Cotton | Polyester | Wool | p-value | |
|---|---|---|---|---|
| SOL (min) | 18.5±23.5 | 18.2±15.5 | 16.0±15.5 | 0.04 |
| REM sleep latency (min) | 82.5±34.2 | 88.9±46.7 | 82.6±49.0 | 0.33 |
| N1 (%) | 5.3±4.0 | 4.6±2.5 | 4.6±2.7 | 0.57 |
| N2 (%) | 58.6±9.0 | 57.5±8.6 | 57.8±8.0 | 0.70 |
| N3 (%) | 15.9±5.4 | 16.1±6.8 | 16.5±5.7 | 0.91 |
| REM sleep (%) | 20.2±5.7 | 21.5±6.3 | 21.1±6.1 | 0.58 |
| TST (min) | 363.4±56.0 | 364.2±62.6 | 373.1±60.4 | 0.30 |
| SE (%) | 76.2±11.0 | 76.4±12.4 | 78.4±12.6 | 0.32 |
| WASO (min) | 97.0±52.3 | 95.8±56.6 | 89.1±57.0 | 0.76 |
| AI (no.h−1) | 10.3±7.1 | 9.6±6.0 | 10.5±6.4 | 0.36 |
| SFI (no. h−1) | 13.3±5.8 | 13.7±4.4* | 12.1±4.2* | 0.01 |
Notes: Data presented as mean ± SD, N=36. *p<0.05 for difference between polyester and wool.
Bold values indicate significant sleepwear effect on SOL but there was no significant difference among sleepwear types in the post-hoc pairwise comparisons.
Abbreviations: SOL, sleep onset latency; REM, rapid eye movement; TST, total sleep time; N1(%), sleep stage 1 as a percentage of TST; N2(%), sleep stage 2 as a percentage of TST; N3(%), sleep stage 3 as a percentage of TST; SE, sleep efficiency; WASO, wake after sleep onset; AI, arousal index; SFI, sleep fragmentation index.