Table 1 Sleep habits by school grade.
From: Association between sleep habits/disorders and emotional/behavioral problems among Japanese children
Bedtime | Wake time | Nap (min) | SL (min) | WASO (min) | TIB (hour) | TST (hour) | SE (%) | |
|---|---|---|---|---|---|---|---|---|
Elementary school | ||||||||
First grade | 21:06 (36) | 6:36 (24) | 0.1 (2.1) | 15.9 (10.9) | 0.7 (2.5) | 9.5 (0.6) | 9.2 (0.6) | 97.1 (2.0) |
Second grade | 21:17 (36) | 6:36 (24) | 0.1 (1.9) | 16.0 (11.3) | 0.6 (2.2) | 9.4 (0.5) | 9.1 (0.5) | 97.1 (2.1) |
Third grade | 21:24 (36) | 6:42 (0.4) | 0.1 (2.0) | 16.2 (11.7) | 0.8 (3.0) | 9.2 (0.6) | 9.0 (0.6) | 97.0 (2.3) |
Fourth grade | 21:36 (36) | 6:42 (24) | 0.2 (2.1) | 16.3 (12.2) | 0.8 (2.7) | 9.0 (0.6) | 8.7 (0.6) | 96.8 (2.4) |
Fifth grade | 21:48 (36) | 6:42 (24) | 0.2 (2.5) | 16.7 (13.0) | 0.7 (2.9) | 8.8 (0.6) | 8.5 (0.6) | 96.7 (2.6) |
Sixth grade | 22:06 (42) | 6:42 (24) | 0.2 (2.5) | 16.5 (13.5) | 0.8 (3.1) | 8.6 (0.7) | 8.3 (0.7) | 96.7 (2.7) |
Junior high school | ||||||||
First grade | 22:36 (42) | 6:30 (30) | 0.4 (3.6) | 15.8 (13.8) | 0.7 (3.3) | 7.9 (0.7) | 7.6 (0.7) | 96.5 (3.1) |
Second grade | 22:54 (42) | 6:36 (30) | 0.6 (4.1) | 15.9 (14.3) | 0.8 (3.3) | 7.7 (0.7) | 7.4 (0.7) | 96.4 (3.2) |
Third grade | 23:18 (42) | 6:54 (30) | 0.8 (5.1) | 16.3 (14.5) | 0.7 (3.5) | 7.5 (0.7) | 7.2 (0.7) | 96.2 (3.3) |
Overall | 21:54 (54) | 6:36 (24) | 0.3 (2.8) | 16.2 (12.6) | 0.7 (2.9) | 8.8 (0.9) | 8.5 (0.9) | 96.8 (2.6) |
