Table 2 The distribution of sleep at 18 months
Items | 18 months (n = 207) | |
|---|---|---|
n | % | |
Waking up time | ||
 5 ~ o’clock | 1 | 0.5 |
 6 ~ o’clock | 54 | 26.1 |
 7 ~ o’clock | 110 | 53.1 |
 8 ~ o’clock | 31 | 15.0 |
 9 ~ o’clock | 8 | 3.9 |
 10 ~ o’clock | 1 | 0.5 |
 11 ~ o’clock | 2 | 1.0 |
Sleep onset time | ||
 19 ~ o’clock | 2 | 1.0 |
 20 ~ o’clock | 28 | 13.5 |
 21 ~ o’clock | 102 | 49.3 |
 22 ~ o’clock | 56 | 27.1 |
 23 ~ o’clock | 14 | 6.8 |
 24 ~ o’clock | 5 | 2.4 |
Daytime naps duration (h) | ||
 0 | 12 | 5.8 |
 ~ 1 | 20 | 9.7 |
 ~ 2 | 118 | 57.0 |
 ~ 3 | 47 | 22.7 |
 ~ 4 | 10 | 4.8 |
 4~ | – | – |
Nocturnal sleeping duration (h) | ||
 5~ | 3 | 1.4 |
 7~ | 1 | 0.5 |
 8~ | 15 | 7.2 |
 9~ | 98 | 47.3 |
 10~ | 76 | 36.7 |
 11~ | 12 | 5.8 |
 12~ | 2 | 1.0 |
Total sleeping duration (h) | ||
 8~ | 1 | 0.5 |
 9~ | 11 | 5.3 |
 10~ | 30 | 14.5 |
 11~ | 79 | 38.2 |
 12~ | 69 | 33.3 |
 13~ | 14 | 6.8 |
 14~ | 3 | 1.4 |