National College Health Assessment: self-reported sleep behaviour among full-time undergraduate students who self-identify as varsity athletes at NCAA member Institutions (n=14 134)12(p20)
| Sleep behaviours | Reported response option | Percent of varsity athletes |
| Sleep difficulties in the past 12 months. | Traumatic or very difficult to handle. | 24 |
| Falling asleep at night. | Extreme difficulty at least three nights in the last week. | 24 |
| Awaking too early and unable to go back to sleep. | Occurred at least three nights in the last week. | 16 |
| Getting enough sleep to feel rested. | Insufficient sleep more than 3 days out of past 7; Insufficient sleep 6–7 days out of past 7. | 57 23 |
| Daytime tiredness. | Felt tired, dragged out or sleepy at least 3 days during the last week; reported that daytime sleepiness has been a big problem in last 7 days. | 61 17 |
| Negative consequences of sleep difficulties. | Academic performance. | 18 |