Table 5.
Self-reported sleep-wake habits, sleep need, and caffeine intake in MT, NT and ET subject
| MT (N=15) | NT (N=15) | ET (N=16) | |||
|---|---|---|---|---|---|
| Mean (SD) | p | Post hoc | |||
| Work day: | |||||
| Bedtime | 23:25 (55) | 23:00 (235) | 00:23 (47)* | 0.044 | MT<ET |
| Wake time | 06:16 (43) | 07:27 (30) | 07:51 (94)** | <0.001 | MT<NT=ET |
| Midsleep time | 02:51 (34) | 03:37 (49) | 04:07 (67)** | <0.0001 | MT<NT=ET |
| Sleep latency (min) | 13.33 (12.38) | 9.17 (7.42) | 18.68 (12.76) | 0.089 | |
| Sleep duration (hr) | 6.67 (1.29) | 7.20 (1.24) | 7.50 (1.17) | 0.211 | |
| Free day: | |||||
| Bedtime | 23:36 (55) | 23:37 (223) | 01:36 (102)** | 0.003 | MT=NT<ET |
| Wake time | 06:49 (45) | 08:37 (80) | 10:02 (115)** | <0.001 | MT<NT<ET |
| Midsleep time | 03:12 (39) | 04:31 (74) | 05:49(101)** | <0.001 | MT<NT<ET |
| Sleep latency (min) | 13.83 (10.85) | 8.87 (6.84) | 17.61 (11.56) | 0.095 | |
| Sleep duration (hr) | 7.10 (1.12) | 8.60 (1.23) | 9.32 (1.31)** | <0.001 | MT<NT=ET |
| Sleep need (hr) | 7.40 (1.39) | 8.33 (1.11) | 8.61 (1.52) | 0.71 | |
| Caffeine intake (cup/ day) | 2.25 (1.07) | 1.93 (1.32) | 2.52 (2.11) | 0.488 | |
*
p<0.05,
**
p<0.01 (Kruskal-Wallis test)
SD presented as minutes
MT: Morning type; NT: Neither type; ET: Evening type