Table 1.
Demographic data, psychological traits, and sleep evaluationa
| Experiment 1 |
Experiment 2 |
|||||
|---|---|---|---|---|---|---|
| SC (n = 22) | SD (n = 25) | p | SC (n = 17) | SD (n = 19) | p | |
| Age (yr) | 23.3 ± 1.2 | 23.2 ± 1.7 | 0.868 | 24.0 ± 1.2 | 24.1 ± 1.5 | 0.819 |
| Male, n (%) | 13 (59.1) | 14 (56.0) | 0.831 | 9 (52.9) | 9 (47.4) | 0.738 |
| BMI (kg/m2) | 21.6 ± 2.5 | 21.0 ± 2.6 | 0.433 | 20.5 ± 2.1 | 21.4 ± 2.7 | 0.265 |
| Education (yr) | 17.0 ± 1.3 | 16.7 ± 1.6 | 0.582 | 18.1 ± 1.2 | 18.0 ± 1.3 | 0.785 |
| BDI | 1.4 ± 2.0 | 2.3 ± 2.5 | 0.157 | 2.6 ± 1.9 | 1.7 ± 1.9 | 0.162 |
| HAMA | 2.2 ± 2.1 | 3.6 ± 3.4 | 0.105 | 3.7 ± 3.6 | 2.1 ± 2.2 | 0.103 |
| BIS | 62.5 ± 4.2 | 62.7 ± 9.5 | 0.951 | 62.6 ± 7.9 | 61.5 ± 6.3 | 0.656 |
| Attentional impulsiveness | 21.9 ± 2.7 | 21.4 ± 3.5 | 0.585 | 21.1 ± 3.0 | 21.5 ± 3.3 | 0.699 |
| Motor impulsiveness | 15.5 ± 3.0 | 15.6 ± 2.5 | 0.895 | 15.8 ± 3.8 | 15.9 ± 3.0 | 0.873 |
| Nonplanning impulsiveness | 25.2 ± 3.2 | 25.8 ± 4.9 | 0.664 | 25.8 ± 3.2 | 24.1 ± 3.5 | 0.144 |
| MoCA | 29.0 ± 0.8 | 28.8 ± 1.2 | 0.502 | 29.0 ± 1.0 | 28.9 ± 0.8 | 0.860 |
| WM capacity | 51.8 ± 12.2 | 47.2 ± 18.3 | 0.326 | 46.5 ± 12.8 | 51.6 ± 11.6 | 0.218 |
| ESS | 5.8 ± 2.6 | 6.8 ± 2.8 | 0.220 | 8.1 ± 3.6 | 7.1 ± 2.6 | 0.368 |
| PSQI | 3.0 ± 1.4 | 3.1 ± 1.7 | 0.253 | 4.4 ± 2.1 | 3.7 ± 1.8 | 0.309 |
| Habitual sleep duration (h)b | 7.3 ± 0.5 | 7.5 ± 0.6 | 0.718 | 7.5 ± 0.8 | 7.2 ± 0.6 | 0.214 |
| MEQ | 54.5 ± 7.1 | 52.3 ± 7.2 | 0.313 | 52.0 ± 7.9 | 55.4 ± 5.8 | 0.160 |
aData are mean ± standard deviation. BMI, Body mass index.
bHabitual sleep duration came from participants' answers to the question in PSQI; that is, “How many hours of actual sleep did you get at night during the past month?”