One Month-old Infants Sleep at Night at Home

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  • 1か月児の家庭における終夜睡眠
  • 1カゲツジ ノ カテイ ニ オケル シュウヤ スイミン

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This study set out to clarify the characteristics of infant sleep-wake states by behavioral observation at night at the first month after birth. A total of 36 healthy first-born infants (average age 30.8 days) participated in this study. Infant sleep-wake states in the night were recorded using video-somnography for two consecutive nights, and data of the second night coded and analyzed using an established protocol.<BR>Mean total sleep time was 7.4 hours, 70% of the mean total recording period. The ratio of the percent of total sleep time in active sleep (AS) to the percent of total sleep time in quiet sleep (QS) was 7: 3. The mean length of all sleep periods was 124 minutes. Principal component analysis of night sleep yielded two components:“sleep stability”and“sleep depth”. The component of“sleep stability”consisted four variables: mean sleep period; percentage of sleep time; number of waking; and standard deviation of awake period. The component of“sleep depth”consisted two variables: % AS and % QS. Two variables from this analysis, mean sleep period and standard deviation of awake period are newly defined sleep parameters, and should be considered actual sleep features of one month-old infants.<BR>It is necessary to examine these newly identified sleep parameters in more depth. Moreover, it is important to discover whether and how patterns at one month persist in later months. Further studies using the methods of this study and also methods to document mother-infant interactions during nighttime sleep and feeding are indicated.

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