Table 1.
Sleep parameters at baseline (non-fragmented sleep, night 1) and during the 2 nights of sleep fragmentation (nights 2 and 3).
| Baseline night 1 | Fragmentation night 2 | Fragmentation night 3 | Friedman ANOVA p-value | ||||
|---|---|---|---|---|---|---|---|
| median | interquartile range | median | interquartile range | median | interquartile range | ||
| TIB, min | 480.0 | 479.5–483.0 | 480.0 | 479.0–484.0 | 479.5 | 479.0–481.5 | NS |
| SPT, min | 474.5 | 470.5–480.5 | 476.0 | 464.0–480.0 | 477.5 | 474.5–480.5 | NS |
| TST, min | 452.0 | 437.5–463.5 | 443.0 | 428.0–458.5 | 454.5 | 438.0–459.0 | NS |
| SL, min | 5.5 | 3.0–10.5 | 4.5 | 2.0–16.5 | 2.5 | 1.0–16.5 | 0.02 |
| FRL, min | 68.0 | 63.5–91.0 | 84.5 | 78.5–112.0 | 83.0 | 73.0–137.0 | NS |
| Stage shifts/hour | 11.5 | 11.3–16.8 | 21.9 | 18.8–29.5 | 22.4 | 16.1–30.9 | 0.002 |
| Awakenings/hour | 3.4 | 2.9–4.7 | 6.6 | 5.4–8.6 | 5.9 | 3.9–7.1 | 0.014 |
| SE, % | 94.3 | 88.1–96.2 | 91.7 | 89.6–95.2 | 94.5 | 88.9–95.7 | NS |
| WASO, % | 4.0 | 2.9–7.7 | 6.0 | 4.1–8.1 | 5.1 | 3.5–9.9 | NS |
| S1, % | 3.6 | 2.8–8.3 | 16.4 | 8.4–20.2 | 10.8 | 9.3–17.9 | 0.0002 |
| S2, % | 53.3 | 50.5–58.7 | 57.2 | 47.2–59.0 | 54.8 | 47.6–58.8 | NS |
| SWS, % | 11.9 | 10.8–16.2 | 2.3 | 0.9–3.3 | 2.1 | 0.9–7.7 | 0.001 |
| REM, % | 21.8 | 18.8–23.0 | 17.5 | 15.0–21.5 | 19.8 | 17.8–21.3 | NS |
| Arousal index, n/hour | 14.2 | 12.0–17.6 | 36.8 | 21.9–51.0 | 30.0 | 18.8–39.0 | 0.025 |
TIB: time in bed, SPT: sleep period time, TST: total sleep time, SL: sleep latency, FRL: first REM latency, SE: sleep efficiency.