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Table 2 The distribution of sleep at 18 months

From: The relationship between the development of social competence and sleep in infants: a longitudinal study

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