Table 2.
Means (SD) for Consecutive School Nights and Weekend Nights.
| School night | Weekend night | ||||||
|---|---|---|---|---|---|---|---|
| 1st | 2nd | 3rd | 4th | 5th | 1st | 2nd | |
| Bedtime | |||||||
| Australia | 22.6 (1.3) | 22.4 (1.1) | 22.4 (1.2) | 22.4 (1.0) | 22.6 (1.1) | 23.3 (1.5) | 23.7 (1.7) |
| United States | 23.2 (1.4) | 22.9 (1.3) | 22.9 (1.1) | 23.0 (1.2) | 23.0 (1.2) | 24.0 (1.6) | 24.3 (1.7) |
| United States (S) | 22.9 (1.3) | 22.6 (1.3) | 22.6 (1.2) | 22.6 (1.2) | 23.1 (1.5) | 23.9 (1.8) | 23.9 (1.5) |
| Qatar | 22.3 (1.5) | 21.8 (1.4) | 22.0 (1.7) | 21.9 (1.6) | 21.8 (1.8) | 23.0 (1.7) | 23.1 (2.3) |
| United Kingdom | 21.9 (1.4) | 21.7 (1.1) | 21.8 (0.9) | 21.8 (0.9) | 21.9 (0.9) | 22.3 (1.5) | 22.7 (1.6) |
| SOL | |||||||
| Australia | 18 (25) | 16 (18) | 17 (20) | 17 (19) | 16 (19) | 16 (20) | 16 (20) |
| United States (S) | 14 (19) | 14 (12) | 16 (13) | 14 (12) | 12 (10) | 12 (15) | 10 (11) |
| Qatar | 36 (46) | 34 (56) | 28 (33) | 32 (43) | 28 (31) | 26 (36) | 34 (68) |
| United Kingdom | 30 (33) | 30 (32) | 32 (31) | 29 (33) | 30 (32) | 27 (29) | 27 (31) |
| Sleep duration | |||||||
| Australia | 506 (89) | 498 (80) | 494 (79) | 495 (78) | 494 (81) | 520 (100) | 517 (112) |
| United States | 462 (104) | 450 (88) | 454 (86) | 444 (85) | 450 (86) | 521 (115) | 516 (125) |
| United States (S) | 442 (95) | 448 (101) | 446 (95) | 462 (104) | 443 (74) | 493 (112) | 498 (130) |
| Qatar | 462 (134) | 462 (104) | 466 (108) | 459 (108) | 464 (95) | 506 (134) | 523 (116) |
| United Kingdom | 517 (87) | 512 (71) | 507 (66) | 504 (65) | 505 (63) | 536 (83) | 547 (94) |
| WASO | |||||||
| Australia | 4 (10) | 7(14) | 6 (14) | 5 (15) | 5 (17) | 7 (19) | 6 (15) |
| Wake time | |||||||
| Australia | 7.5 (1.4) | 7.2 (1.0) | 7.1 (1.0) | 7.1 (0.9) | 7.2 (1.7) | 8.4 (1.6) | 8.6 (1.6) |
| United States | 7.0 (1.6) | 6.6 (1.5) | 6.6 (1.1) | 6.5 (1.0) | 6.6 (1.1) | 8.6 (1.7) | 8.9 (1.7) |
| United States (S) | 6.9 (1.1) | 6.5 (0.7) | 6.4 (1.0) | 6.5 (0.8) | 6.6 (1.3) | 8.4 (1.7) | 8.5 (1.5) |
| Qatar | 6.4 (2.2) | 5.6 (2.0) | 5.8 (1.2) | 5.6 (1.3) | 5.7 (1.2) | 7.6 (1.2) | 8.4 (2.2) |
| United Kingdom | 7.2 (1.6) | 6.9 (1.2) | 6.9 (0.7) | 6.8 (0.6) | 6.9 (0.6) | 7.7 (0.7) | 8.4 (1.4) |
School nights are Saturday to Wednesday nights for Qatar, and Sunday to Thursday nights for Australia, United Kingdom, and United States. Weekend nights are Thursday and Friday for Qatar, and Friday and Saturday nights for Australia, United Kingdom, and United States. United States (S) indicates the subsample of 55 US adolescents. SOL, sleep onset latency; WASO, wake after sleep onset.