Table 1 Seasonal differences in sleep
Season for attending the study | |||||
|---|---|---|---|---|---|
Polar night | Spring | Polar Day | Autumn | p3 | |
Mean sleep duration | 7.12 (0.96)1 | 7.17 (1.00)1 | 7.15 (1.01)1 | 7.14 (1.01)1 | 0.20 |
Usually suffering from sleeplessness during Polar night | 420 (14.0)2 | 261 (14.3)2 | 136 (10.1)2 | 271 (9.8) 2 | 0.008 |
Current sleeping problems | 278 (9.4)2 | 79 (4.4)2 | 74 (5.6)2 | 134 (4.9)2 | <0.001 |
-rather more than usual | 223 (7.5) | 69 (3.8) | 62 (4.7) | 116 (4.3) | <0.001 |
-much more than usual | 55 (1.9) | 10 (0.6) | 12 (0.9) | 18 (0.7) | <0.001 |