Outline of the Third Longitudinal Survey of Newborns in the 21st Century

5) Bedtime, wakeup time and nap frequency

As for combination of bedtime and wakeup time, the largest proportion of the subjects (23.0%) goes to bed "in the 9:00 pm range" and wake up "in the 7:00 am range". Bedtimes in general became later than that of the previous survey. "In the range of 10 hours (40.2%)" and "In the range of 9 hours (29.5%) were most common sleeping hours calculated from the combination of bedtime and wakeup time. Those who "rarely take a nap" slept longer at night; specifically, 50.1% of those slept "more than 11 hours". (Table 8, 9)

Table 8 Bedtime and wakeup time for children (Unit: %)

2nd Survey 3rd Survey: wakeup time

Bedtime Total Before 6 am 6:00 - 6:59 am 7:00 - 7:59 am 8:00 - 8:59 am 9:00 - 9:59 am After 10:00 am Irregular Unknown

Bed time Total (100.0) 100.0 1.3 18.0 46.5 22.7 6.7 1.7 2.6 0.4

Before 8 pm (1.7) 1.3 0.2 0.7 0.4 0.0 0.0 0.0 - -

8:00 - 8:59 pm (14.9) 10.5 0.6 4.6 4.7 0.5 0.0 0.0 0.0 0.0

9:00 - 9:59 pm (41.1) 39.2 0.4 10.1 23.0 5.2 0.4 0.0 0.1 0.0

10:00 - 10:59 pm (26.6) 31.8 0.1 2.4 15.4 11.2 2.3 0.2 0.2 0.0

After 11:00 pm (10.2) 12.1 0.0 0.1 1.9 4.6 3.4 1.4 0.6 0.0

Irregular (3.8) 4.5 0.0 0.1 1.0 1.1 0.5 0.1 1.7 0.0

Unknown (1.8) 0.7 - 0.1 0.1 0.1 0.0 0.0 0.0 0.4

Note: Calculated based on total responses from the 2nd and 3rd surveys.

Table 9 Sleeping hours in the breakdown of nap frequency for children

(Unit: %)

Sleeping hours

Total Less than 8 hours In the range of 8 hours In the range of 9 hours In the range of 10 hours In the range of 11 hours Irregular Unknown

Nap Total (100.0) 100.0 2.1 7.4 29.5 40.2 14.6 5.5 0.7

Everyday (70.6) 100.0 2.6 8.8 35.3 40.7 8.6 3.7 0.4

Sometimes (21.8) 100.0 1.2 5.0 18.5 41.7 22.5 10.6 0.5

Rarely (7.2) 100.0 0.3 1.8 7.7 32.1 50.1 7.6 0.4

Unknown (0.4) 100.0 0.6 - 3.2 1.3 - 0.6 94.2

Note: Nap hours is not included in the sleeping hours.

Where "nursery school teachers" or "nursery mothers or babysitters" act as caregivers during daytime, 96.5% and 90.6% of subjects take a nap "everyday" respectively; representing a higher percentage than in other caregivers. (Table 10)

Table 10 Children's nap frequency in the breakdown of caregivers in the day

(Unit: %)

Total Everyday Sometimes Rarely Unknown

Total (100.0) 100.0 70.6 21.8 7.2 0.4

Mother (70.7) 100.0 61.8 28.1 9.8 0.3

Father (0.2) 100.0 69.7 24.7 3.4 2.2

Grandmother (4.9) 100.0 75.4 20.7 3.6 0.3

Grandfather (0.3) 100.0 71.8 22.1 5.4 0.7

Nursery school teacher (23.1) 100.0 96.5 2.9 0.1 0.4

Nursery mother/Babysitter (0.1) 100.0 90.6 7.5 1.9 -

Others (0.3) 100.0 72.3 21.4 5.4 0.9

Unknown (0.3) 100.0 73.7 21.2 3.6 1.5

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