Table 4.
Sleep duration category at Phase 7 defined by change in number of hours sleep between Phase 5 and Phase 7
| Sleep duration category | Women (N = 1459) | Men (N = 3972) |
|---|---|---|
| No change in sleep duration | % (N) | % (N) |
| ≤ 5 h at both phases | 4.7 (68) | 3.0 (120) |
| 6 h at both phases | 16.7 (243) | 18.9 (752) |
| 7 h at both phases | 19.5 (284) | 27.8 (1103) |
| 8 h at both phases | 8.1 (118) | 7.5 (298) |
| ≥ 9 h at both phases | 0.5 (7) | 0.6 (23) |
| Total – no change in sleep duration | 49.5 (720) | 57.8 (2327) |
| Decrease from 9 hours (9 h sleep at Phase 5 and < 9 h at Phase 7) | 1.3 (19) | 0.7 (26) |
| Increase from ≤ 5 or 6 hours (≤ 5 or 6 h sleep at Phase 5 and > 5 or 6 h, respectively, at Phase 7) | 16.7 (243) | 14.6 (580) |
| Decrease from 6, 7 or 8 hours (6, 7, or 8 h sleep at Phase 5 and < 6, 7, or 8 h, respectively at Phase 7) | 25.3 (369) | 18.3 (727) |
| Increase from 7 or 8 hours (7 or 8 h sleep at Phase 5 and > 7 or 8 h, respectively, at Phase 7) | 7.4 (108) | 8.6 (343) |