Demographic variables
| Characteristics | Sample (n=50) |
| Age in years, mean (SD, range) | 13.71 (1.35, 12–16) |
| Age in years, n (%) | |
| 12 | 10 (20.4) |
| 13 | 15 (30.6) |
| 14 | 7 (14.3) |
| 15 | 12 (24.5) |
| 16 | 5 (10.2) |
| Female, n (%) | 33 (66) |
| Born in Australia, n (%) | 47 (94) |
| Live in the city, n (%) | 44 (88) |
| Sleep problems, n (%) | |
| Difficulty falling asleep | 47 (94) |
| Difficulty staying asleep | 28 (56) |
| Problems waking up too early | 28 (56) |
| Receiving treatment for sleep or mental health problem, n (%) | 13 (26) |
One participant did not indicate their age, so n=49 for age.