Table 2.
Means and standard deviations (in brackets) of PSG measures at baseline and following sleep delay
| Healthy Controls (n = 16) |
Alcohol Dependent (n = 48) |
|||
|---|---|---|---|---|
| Baseline | Delay | Baseline | Delay | |
| Total Sleep Period (min) | 412.9 (5.1) | 419.4 (4.1) | 406.1 (18.1) | 405.4 (22.6) |
| Sleep Latency (min)* | 12.1 (4.1) | 4.3 (5.5) | 9.0 (11.9) | 3.8 (3.3) |
| Sleep Efficiency (%) | 95.9 (1.7) | 93.0 (5.9) | 92.5 (6.0) | 92.2 (6.4) |
| Awake and movement (%) | 2.6 (2.4) | 4.3 (3.3) | 4.8 (4.4) | 5.3 (4.1) |
| % Stage 1 | 3.4 (2.4) | 5.1 (4.2) | 7.0 (4.8) | 6.3 (3.7) |
| % Stage 2* | 56.7 (8.0) | 54.1 (7.5) | 54.7 (9.0) | 50.8 (9.1) |
| % SWS | 11.3 (5.1) | 12.2 (4.9) | 9.9 (5.4) | 10.5 (5.5) |
| %REM | 24.0 (4.9) | 24.2 (6.5) | 23.5 (6.4) | 27.2 (6.0) |
| REM Latency | 73.3 (22.0) | 65.8 (12.7) | 65.5 (24.4) | 43.4 (28.5) |
| REM Density | 3.1 (0.9) | 2.9 (0.8) | 2.7 (1.2) | 2.7 (1.2) |
| Minute SWS in 1st NREM* | 18.6 (9.4) | 22.2 (5.2) | 16.1 (9.3) | 13.3 (10.2) |
Bold font denotes significant group main effect;
*
denotes significant sleep delay main effect; (min) in minutes; % expressed relative to total sleep period.