Table 2 Comparison of sleep architecture between baseline night and simulated ICU noise and light night
Variable | Baseline | NL | P |
|---|---|---|---|
Time in bed (min) | 507.8 ± 21.1 | 509.6 ± 23.7 | 0.860 |
Total sleep time (min) | 424.3 ± 25.9 | 359.2 ± 39.9 | 0.000 |
Sleep efficiency index | 0.83 ± 0.06 | 0.71 ± 0.08 | 0.001 |
REM (%) | 21.9 ± 3.8 | 15.8 ± 4.8 | 0.006 |
N1 (%) | 19.6 ± 3.8 | 19.7 ± 9.8 | 0.983 |
N2 (%) | 39.8 ± 5.1 | 47.8 ± 8.3 | 0.018 |
N3 (%) | 18.7 ± 5.3 | 14.7 ± 4.2 | 0.078 |
Sleep onset latency (min) | 23.4 ± 10.1 | 66.2 ± 20.7 | 0.000 |
REM latency (min) | 147.8 ± 20.1 | 163.9 ± 55.2 | 0.399 |
No. of awakenings | 9.9 ± 3.7 | 14.4 ± 3.3 | 0.011 |
Sleep arousals index | 5.0 ± 1.8 | 8.7 ± 3.3 | 0.006 |