Table 1.
Sample characteristics (mean [standard deviation])
| Young adults (18–30 years) | Older adults (60–72 years) | |||
|---|---|---|---|---|
| Normal night's sleep | Sleep deprivation | Normal night's sleep | Sleep deprivation | |
| Total, n (male) | 63 (36) | 61 (37) | 47 (16) | 47 (16) |
| Age (years) | 23.08 (3.37) | 23.52 (3.1) | 66.30 (3.30) | 67.26 (3.24) |
| BMI (kg/m2) | 22.33 (2.46) | 22.93 (2.41) | 23.54 (2.26) | 23.28 (2.32) |
| Insomnia severity index | 3.56 (2.35) | 3.08 (2.44) | 3.79 (2.84) | 4.19 (2.42) |
| Epworth Sleepiness Scale | 5.40 (2.84) | 5.13 (2.94) | 5.91 (3.37) | 5.77 (3.20) |
| Duration of sleep period 1 night before (hh:mm, A)a | 07:35 (00:56) | . (.) | 08:06 (01:04) | . (.) |
| Sleep start 1 night before (hh:mm, A)a | 23:58 (00:51) | . (.) | 23:08 (01:00) | . (.) |
| Sleep end 1 night before (hh:mm, A)a | 07:34 (00:50) | . (.) | 07:15 (00:39) | . (.) |
| Duration of sleep period 2–3 nights before (hh:mm, A)b | 07:44 (01:01) | 07:49 (00:53) | 07:43 (00:51) | 07:54 (00:45) |
| Sleep start 2–3 nights before (hh:mm, A)b | 00:23 (01:12) | 00:12 (00:53) | 23:41 (00:55) | 23:13 (00:47) |
| Sleep end 2–3 nights before (hh:mm, A)b | 08:07 (01:08) | 08:02 (00:56) | 07:25 (00:40) | 07:07 (00:55) |
| Start time 13.00/16.00 | 32/31 | 30/31 | 25/22 | 27/20 |
a
n = 6 missing;
b
n = 15 missing.
A, Actigraphy; BMI, body mass index.