Dependence of nighttime sleep duration in one-month-old infants on alterations in natural and artificial photoperiod

Iwata, Sachiko; Fujita, Fumie; Kinoshita, Masahiro; Unno, Mitsuaki; Horinouchi, Takashi; Morokuma, Seiichi; Iwata, Osuke

doi:10.1038/srep44749

Cited by 22 publications

(23 citation statements)

References 42 publications

(45 reference statements)

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“…Although no significant risk factors were found in 8‐month‐old infants, the photoperiod during the first 3 months was related to slower development of sleep–wake rhythm at the age of 3 months. This corresponds with findings in animal and infant studies (Brooks & Canal, ; Iwata et al., ). Exposure to a long photoperiod leads to a phase delay in circadian rhythms and thus also affects the sleep–wake cycle.…”

Section: Discussionsupporting

confidence: 91%

“…Animal studies provide evidence that the postnatal light environment affects the development of circadian rhythms (Brooks & Canal, ). Alternations in natural and artificial photoperiods have also been related to infants’ night‐time sleep duration (Iwata et al., ). Moreover, the development of the sleep–wake rhythm might be related to feeding and social cues (McGraw, Hoffmann, Harker, & Herman, ; Mirmiran, Baldwin, & Ariagno, ).…”

Section: Introductionmentioning

confidence: 99%

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Development of sleep–wake rhythms during the first year of age

Paavonen

Morales‐Muñoz

Pölkki

et al. 2019

Journal of Sleep Research

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Circadian rhythms refer to biological rhythms that have an endogenous period length of approximately 24 hr. However, not much is known about the variance in the development of the sleep-wake rhythm. The study objectives were (a) to describe the normative variation in the development of a sleep-wake rhythm in infancy, (b) to assess whether slower development is related to sleep quality and (c) to evaluate factors that are related to the slower development of a sleep-wake rhythm. The study is based on a representative birth cohort. Questionnaires at the ages of 3 (n = 1,427) and 8 months (n = 1,302) and actigraph measurement at 8 months (n = 372) were available. Infants with significant developmental delays (n = 11) were excluded. The results are based on statistical testing and multivariate modelling. We found that the average percentage of daytime sleep was 36.3% (standard deviation [SD], 8.5%) at 3 months and 25.6% (SD, 6.6%) at 8 months. At both time-points, infants with slower sleep-wake rhythm development slept more hours per day, had a later sleep-wake rhythm, more difficulties in settling to sleep and longer sleep-onset latency; they also spent a longer time awake during the night. According to actigraph registrations, we found that the infants with slow development of a sleep-wake rhythm slept less and had a later start and end to night-time sleep than the other infants. Infants' sleep-wake rhythm development is highly variable and is related to parent-reported and objectively measured sleep quality and quantity. Interventions to improve the sleep-wake rhythm might improve sleep quality in these infants. K E Y W O R D Sinfant, sleep, sleep-wake rhythms

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Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Development of sleep–wake rhythms during the first year of age

Paavonen

Morales‐Muñoz

Pölkki

et al. 2019

Journal of Sleep Research

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“…Infant sleep quality and development can be modulated by a number of biopsychosocial factors [23]. These factors include inherited child's characteristics, such as temperament [24] or chronotype [19], perinatal characteristics such as season of birth [25] or photoperiod [26], and environmental characteristics such as parental stress [27]. Following this line of research, our recent study reported that some maternal risk factors during pregnancy are related to infants' sleep difficulties at three months of age [28].…”

Section: Introductionmentioning

confidence: 97%

The role of parental circadian preference in the onset of sleep difficulties in early childhood

et al. 2019

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Background: Chronotype is a construct contributing to individual differences in sleep-wake timing. Previous studies with children have found that evening-types exhibit greater sleep difficulties. Infant sleep quality can be modulated by several factors, such as parental characteristics. We examined the association between parental circadian preference and sleep in early childhood. Methods: This study was based on a longitudinal birth cohort, with several measurement points. We used information regarding parental questionnaires during pregnancy and children's sleep measures at three, eight, 18 and 24 months. In total, 1220 mothers, 1116 fathers, 993 infants at three months, 990 infants at eight months, 958 children at 18 months, and 777 children at 24 months were analyzed. Parental circadian preference was measured using the Horne-€ Ostberg Morningness-Eveningness Questionnaire. Concerning children's sleep, we used the Brief Infant Sleep Questionnaire (BISQ) and the Infant Sleep Questionnaire (ISQ) at each time point. Results: Maternal circadian preference was associated with infants' circadian rhythm development at three, eight, 18 and 24 months. Furthermore, increased maternal eveningness was also related to short sleep during daytime at three months, and nighttime at three and eight months, to long sleep-onset latency at three, 18 and 24 months, to late bedtime at three, eight and 18 months, and to sleep difficulties at eight and 24 months. Paternal circadian preference was not associated with any sleep variable at any time point. Conclusion: Maternal circadian preference is related to several sleep difficulties in early childhood, and it may be considered a potential risk factor for the onset of early sleeping problems.

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“…Data are presented as mean ± standard deviation, number (%) or median (interquartile range). Clinical backgrounds of the study population have been published previously 10 . Of the questionnaires collected from 1,302 participating mothers, data from 31 mothers were excluded due to excessive missing data.…”

Section: Resultsmentioning

confidence: 99%

Peripartum depression and infant care, sleep and growth

Iwata

Kinoshita

Fujita

et al. 2019

Sci Rep

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Peripartum depression is a common, serious complication in mothers. To assess the influence of infant care, sleep and growth on the risk of peripartum depression, 1,271 mothers of healthy one-month-old infants completed comprehensive questionnaires including the Edinburgh Postnatal Depression Scale. Relationships between high depression scores and variables related to infants’ care, sleep and growth were assessed adjusting for other variables. High depression scores were found in 233 mothers, which were associated with variables related to infants’ care (poor satisfaction with infant care support, p < 0.001; mothers’ passive response to night-time fussing, p = 0.001), sleep (dim bedroom lighting, p < 0.05; short sleep duration, p < 0.05) and growth (poor weight gain, p < 0.05), as well as maternal variables (primiparas, p < 0.001; poor income satisfaction, p < 0.001; poor sleep satisfaction, p < 0.001; daytime sleepiness, p = 0.001). Considering the observed association between high depression scores and infants’ care, sleep and growth, a multidisciplinary approach accounting for infant care would be required to prevent peripartum depression.

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Dependence of nighttime sleep duration in one-month-old infants on alterations in natural and artificial photoperiod

Cited by 22 publications

References 42 publications

Development of sleep–wake rhythms during the first year of age

Development of sleep–wake rhythms during the first year of age

The role of parental circadian preference in the onset of sleep difficulties in early childhood

Peripartum depression and infant care, sleep and growth

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