Table 1.
Demographic and Sleep Characteristics of Adult Volunteers in the Study (n = 34)
| Mean (SD) or N (%) | |
|---|---|
| Demographics | |
| Age (years) | 30.2 (7.5) |
| Body mass index (kg/m2) | 26.8 (5.2) |
| Gender | |
| Male | 17 (50%) |
| Female | 17 (50%) |
| Race | |
| African American | 11 (35.3%) |
| White | 23 (64.7%) |
| Average amount consumed within 3 hours of bedtime | |
| Carbohydrates (g) | 21.6 (26.8) |
| Proteins (g) | 6.2 (8.4) |
| Fat (g) | 7.0 (8.2) |
| Sodium (mg) | 294.2 (590.7) |
| Saturated fat (g) | 2.4 (3.3) |
| Calories (kcal) | 188.9 (235.3) |
| Interval between final consumption of each nutrient and bedtime | |
| Time of last meal/snack (hours) | 20.36 (1.11) |
| Carbohydrate-sleep interval (hours) | 4.2 (1.5) |
| Protein-sleep interval (hours) | 4.4 (1.9) |
| Fat-sleep interval (hours) | 4.3 (1.7) |
| Amount in last meal/snack before bedtime | |
| Carbohydrate (g) | 73.5 (34.9) |
| Protein (g) | 27.9 (19.4) |
| Fat (g) | 25.5 (16.7) |
| PSG sleep measures | |
| Total sleep time (hours) | 7.2 (1.2) |
| Stage N2 sleep (minutes) | 219.31 (51.32) |
| Stage N3 sleep (minutes) | 76.9 (25.6) |
| Stage REM sleep (minutes) | 110.9 (39.5) |
| WASO (minutes) | 46.9 (62.9) |
| Actigraphy sleep measures | |
| Sleep start time (hour) | 24.31 (1.11) |
| Sleep duration (minutes) | 408.6 (60.5) |
| Sleep fragmentation (%) | 17.4 (5.9) |
| WASO (minutes) | 38.6 (16.4) |
PSG, polysomnography; WASO, wake after sleep onset; REM, rapid eye movement.