Table 4.
Sleep architecture.
| Placebo | Caffeine | Oolong Tea | |
|---|---|---|---|
| Time in bed (min) | 480.0 | 480.0 | 480.0 |
| Sleep period (min) | 468.6 ± 3.8 | 464.6 ± 5.8 | 460.0 ± 6.8 |
| Total sleep time (min) | 419.4 ± 11.4 | 424.9 ± 11.1 | 411.6 ± 14.9 |
| Sleep efficiency (%) | 87.4 ± 2.4 | 88.6 ± 2.3 | 85.7 ± 3.1 |
| Sleep latency (min) | 11.0 ± 3.8 | 6.1 ± 1.7 | 12.5 ± 6.2 |
| Wake after sleep onset (min) | 49.6 ± 12.1 | 48.5 ± 11.4 | 56.0 ± 15.9 |
| REM latency * (min) | 92.4 ± 7.6 | 84.7 ± 11.5 | 107.8 ± 15.5 |
| N1 (min) | 73 ± 9.8 | 68.8 ± 10.6 | 56.7 ± 7.3 |
| N2 (min) | 199.3 ± 9.7 | 216.0 ± 12.1 | 200.1 ± 10.0 |
| N3 (min) | 61.3 ± 13.9 | 55.5 ± 14.6 | 69.5 ± 15.7 |
| R (min) | 85.8 ± 5.4 | 84.6 ± 3.2 | 85.4 ± 7.6 |
Values are means ± SE. * REM latency from sleep onset epoch to first REM epoch.