Table 2 Differences between night 2 and night 1 for observed sleep parameters.
| Variable | 2–6 years | p | 7–12 years | p | 13–17 years | p | |||
|---|---|---|---|---|---|---|---|---|---|
| Night 1 | Night 2 | Night 1 | Night 2 | Night 1 | Night 2 | ||||
| Stage 1 (%TST) | 2.5 (0.5) | 3.2 (1.2) | ns | 3.0 (0.5) | 2.7 (0.4) | ns | 4.7 (1.1) | 3.9 (1.1) | ns |
| Stage 2 (%TST) | 39.0 (2.0) | 37.8 (2.0) | ns | 40.1 (1.2) | 36.3 (1.8) | 0.03 | 48.1 (10.6) | 43.8 (8.8) | 0.05 |
| Stage 3 (%TST) | 10.3 (0.8) | 12.3 (1.2) | ns | 12.4 (1.0) | 11.3 (1.0) | ns | 10.2 (1.2) | 9.4 (1.1) | ns |
| Stage 4 (%TST) | 23.1 (1.9) | 20.4 (1.5) | ns | 21.9 (0.9) | 21.9 (1.1) | ns | 18.4 (1.9) | 15.1 (1.4) | 0.02 |
| REM (%TST) | 25.1 (1.4) | 28.0 (0.8) | 0.03 | 22.5 (0.8) | 27.8 (1.0) | <0.001 | 18.6 (1.2) | 27.9 (1.3) | <0.001 |
| SL (min) | 40.4 (8.2) | 38.2 (4.8) | ns | 41.0 (6.4) | 33.0 (4.0) | ns | 37.1 (6.7) | 43.9 (9.4) | ns |
| REML (min) | 117.7 (10.7) | 85.0 (8.2) | 0.006 | 137.6 (9.9) | 127.8 (9.7) | ns | 143.1 (25.2) | 91.3 (10.4) | 0.03 |
| Sleep efficiency (TST/TIB; %) | 85.3 (1.5) | 80.0 (2.8) | ns | 81.4 (1.8) | 84.2 (1.1) | ns | 79.3 (3.2) | 82.4 (1.9) | ns |
| Sleep efficiency (TST/SPT; %) | 91.6 (1.1) | 90.0 (1.0) | ns | 90.0 (1.3) | 91.4 (0.7) | ns | 87.9 (3.0) | 92.0 (1.3) | ns |
All data are presented as mean (SE).