Daytime nap controls toddlers’ nighttime sleep

Nakagawa, Machiko; Ohta, Hidenobu; Nagaoki, Yuko; Shimabukuro, Rinshu; Asaka, Yoko; Takahashi, Noriko; Nakazawa, Takayo; Kaneshi, Yousuke; Morioka, Keita; Oishi, Yoshihisa; Azami, Yuriko; Ikeuchi, Mari; Takahashi, Mari; Hirata, Michio; Ozawa, Miwa; Cho, Kazutoshi; Kusakawa, Isao; Yoda, Hitoshi

doi:10.1038/srep27246

Cited by 32 publications

(26 citation statements)

References 17 publications

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“…These estimates are much lower than those in Western countries, such as Australia [23], Canada [22], the U.S. [50], or European countries [51]. The differences of night-time sleep duration between these Western studies and our current study may be partly due to discrepancies in daytime napping behaviour across cultures [52], and nap duration has been shown to negatively correlate with night-time sleep duration in young children [53].…”

Section: Discussioncontrasting

confidence: 67%

Socio-demographic and maternal predictors of adherence to 24-hour movement guidelines in Singaporean children

Chen

Bernard

Padmapriya

et al. 2019

Int J Behav Nutr Phys Act

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Purpose: Integrated 24-Hour Movement Guidelines provide specific recommendations on screen viewing (SV), moderate-to-vigorous physical activity (MVPA) and sleep to improve health of children and youth. However, few studies have examined whether these guidelines are met in young children, particularly in Asia. We evaluated adherence to integrated and individual guidelines and its predictors in 5.5-year-old Singaporean children. Methods: Growing Up in Singapore towards Healthy Outcomes (GUSTO) is a mother-offspring birth cohort study. At age 5.5 years, child SV was reported by parents. Movement behaviours (MBs) were measured continuously using wrist-worn accelerometers over 7 consecutive days and nights. For accelerometer data including ≥3 days with ≥16 h/day we estimated mean (±SD) daily MVPA, SV and nighttime sleep duration across the week. Adherence to integrated (Canadian/Australian) guidelines was defined as meeting all individual guidelines: ≥60 min of MVPA/day, ≤2 h of screen time/day, and 9-11 h of sleep/night. Socio-demographic and maternal predictors collected at pregnancy enrolment and at 26-28 weeks' gestation were examined by multivariable logistic regression. Results: Of 864 children followed up age 5.5 years, 547 (63.3%) had both valid ActiGraph and questionnaire data (51.7% boys and 58.3% Chinese ethnicity). Children averaged 101.9 (± 88.7) min/day SV, 67.3 (± 23.7) min/day MVPA and 480.6 (± 57.2) min/night sleep. Few children met integrated guidelines. Specifically, the proportions of children who met none, SV, MVPA, sleep and integrated guidelines were 11.2, 70.2, 59.6, 13.7 and 5.5%, respectively. Multivariable analysis showed that maternal activity and television (TV) viewing were associated with meeting integrated guidelines (insufficiently vs. highly active (OR [95% CI]): 0.11 [0.01, 0.95]; 2-3 vs. ≥ 3 h TV: 3.52 [1.02, 12.22]). Examining higher adherence to individual guidelines, Chinese ethnicity, younger maternal age and lower maternal TV and sleep time were associated with greater SV; male sex, Malay ethnicity, higher birth order and higher maternal activity level were associated with greater MVPA; and older maternal age was associated with adherence to sleep guideline.

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Section: Discussioncontrasting

confidence: 67%

Socio-demographic and maternal predictors of adherence to 24-hour movement guidelines in Singaporean children

Chen

Bernard

Padmapriya

et al. 2019

Int J Behav Nutr Phys Act

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“…Interestingly, daytime napping was a protective factor against shorter night-time sleep; toddlers who napped for 2 hours or more were at a decreased risk for shorter night-time sleep than their counterparts who napped for <2 hours. This is in contrast to findings reported by Akacem et al 49 Moreover, Nakagawa et al, 50 in a cross-sectional study among 50 children 1.5 years of age at a clinic in Tokyo, demonstrated that the longer the nap duration as denoted by "later nap-ending time", the later the toddlers' sleep onset and consequently the shorter the sleep duration at night. On the other hand, Komada et al 51 in a sample of 967 children aged 0-5 years found no significant differences in night sleep duration associated with napping duration in children younger than 2 years of age.…”

Section: Discussioncontrasting

confidence: 62%

Factors associated with shorter night-time sleep in toddlers: The Survey of Young Canadians

Costanian

Abdullah

Sawh

et al. 2017

Can J Public Health

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OBJECTIVES: Adequate sleep in childhood is important for healthy development. No information exists on the predictors of night-time sleep among toddlers in Canada. The aim of this study was to determine the prevalence of and to identify factors associated with sleeping <11 consecutive hours per night among children aged 1-2 years in Canada.METHODS: Data from the cross sectional Survey of Young Canadians (SYC) 2010 were used. The biological mother reported on toddlers' sleep duration at night. Based on cut-off values used in previous studies, shorter night-time sleep was defined as sleeping <11 hours per night. Multivariable logistic regression was conducted to identify the associations between socio-demographic, maternal, sleep and child-related variables with shorter sleep at night. RESULTS:Analysis of 3675 toddlers revealed that 57% slept <11 hours per night. Results of the regression analysis showed that being from an immigrant family was significantly associated with shorter night-time sleep. Being from a higher income household, having a mother aged between 25 and 34 years at the time of the survey, and napping ≥2 hours during the day were significantly related to sleeping ≥11 hours per night. Other socio-demographic, maternal and child-related variables were not associated with night-time sleep.CONCLUSION: This was the first population-based, nationally representative study to examine factors related to shorter night-time sleep in Canadian toddlers. Socio-demographic factors and nap duration were associated with night-time sleep duration. More adequate early childhood sleep hygiene awareness efforts are recommended, especially in vulnerable populations.KEY WORDS: Children; sleep duration; factors; Canada La traduction du résumé se trouve à la fin de l'article.

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“…For instance, one study showed that toddlers that habitually napped have later melatonin onset time, later bedtime, longer sleep‐onset latency and shorter night‐time sleep (Akacem et al., ). Another study showed that there was a negative correlation between nap duration, sleep onset time and night‐time sleep duration (Nakagawa et al., ). These results are in accordance with our findings and suggest that inappropriate amounts of daytime sleep can have a negative effect on subsequent night‐time sleep.…”

Section: Discussionmentioning

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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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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Daytime nap controls toddlers’ nighttime sleep

Cited by 32 publications

References 17 publications

Socio-demographic and maternal predictors of adherence to 24-hour movement guidelines in Singaporean children

Socio-demographic and maternal predictors of adherence to 24-hour movement guidelines in Singaporean children

Factors associated with shorter night-time sleep in toddlers: The Survey of Young Canadians

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

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