| Variable | Category | Sleeping Time | Total | |
| After 1:00 am (late) | Before 1:00 am (early) | |||
| Sleeping hours |
| |||
|
| <6 hours | 138 | 63 | 201 |
| >6 hours | 32 | 33 | 65 | |
| Total | 170 | 96 | 266 | |
| Awake time |
| |||
|
| Before 7:00 am | 55 | 65 | 120 |
| After 7:00 am | 103 | 27 | 130 | |
| Total | 158 | 92 | 250 | |
| Late sleep associated with bad temper (next day) |
| |||
|
| Yes | 82 | 36 | 118 |
| No | 88 | 60 | 148 | |
| Total | 170 | 96 | 266 | |
| Late sleep affects academic achievement |
| |||
|
| Strongly | 70 | 64 | 134 |
| Average | 95 | 31 | 126 | |
| Weakly | 5 | 1 | 6 | |
| Late sleep affects work success |
| |||
|
| Strongly | 93 | 63 | 156 |
| Average | 75 | 33 | 108 | |
| Weakly | 2 | 0 | 2 | |
| Late sleep decreases work satisfaction |
| |||
|
| Yes | 142 | 85 | 227 |
| No | 28 | 11 | 39 | |
| Early sleep brings |
| |||
|
| Happiness | 159 | 90 | 249 |
| Depression | 11 | 6 | 17 | |