Emerging and entraining patterns of the sleep–wake rhythm in preterm and term infants

Shimada, Mieko; Takahashi, Keiichi; Segawa, Masaya; Higurashi, Makoto; Samejim, Michikazu; Horiuchi, K.

doi:10.1016/s0387-7604(99)00054-6

Cited by 58 publications

(45 citation statements)

References 12 publications

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“…24,45,46 Consistent with previous research, no differences in sleeping patterns between very preterm and full-term infants during the first 6 months of life was found. 29,47,48 However, our finding that very preterm infants had increased odds of sleeping problems at 18 months contradicts findings of other studies. 21,35,49 Higher sleeping problems in VL/VLBW infants might reflect insecure or disorganised attachment which has been shown to increase sleeping problems in full-term infants 50 and has been found to be more frequent in VP/VLBW toddlers.…”

Section: 42contrasting

confidence: 99%

Regulatory Problems in Very Preterm and Full-Term Infants Over the First 18 Months

Bilgin

Wolke

2016

Journal of Developmental &Amp; Behavioral Pediatrics

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Section: 42contrasting

confidence: 99%

Regulatory Problems in Very Preterm and Full-Term Infants Over the First 18 Months

Bilgin

Wolke

2016

Journal of Developmental &Amp; Behavioral Pediatrics

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“…Their results suggest that a continuous lighting exposure of preterm infants for several weeks before home discharge does not delay the development of sleep-wake circadian rhythms when an appropriate lighting regimen is experienced at home. In a recent study (24), they reported the mean age of the entrainment to light-dark cycle to be 44.8 wk PCA, much earlier than in their earlier publication and very similar to our own data in preterm and term infants (11,25). Again there were no significant differences in the mean age of the entrainment between preterm and term infants in their study (24).…”

Section: Discussionsupporting

confidence: 84%

“…Shimada et al (21,24), in a large study, also found no differences between term and preterm infants in the circadian rhythm of sleep, duration of day and night sleep, or the time of onset of the longest sustained sleep time. They showed entrainment to day-night rhythm by 48 wk PCA.…”

Section: Discussionmentioning

confidence: 92%

Circadian and Sleep Development in Preterm Infants Occurs Independently From the Influences of Environmental Lighting

2003

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This study investigated the effect of intermediate nursery illumination on circadian rhythm and sleep development of preterm infants. Preterm infants were randomly assigned to one of two intermediate nursery rooms: a dimly lighted room, the dim (control) group, or a day-night lighted room, the cycled (intervention) group. Continuous rectal temperature and sleep were recorded at 36 wk postconceptional age (before discharge) and at 1 and 3 mo corrected age at home. Preterm infants are exposed to continuous low or unpredictable high illumination for several weeks or months in the neonatal intensive care unit (NICU) and intermediate care nursery. These infants are deprived of several potentially important maternal entrainment factors (1-4). This lack of maternal input and exposure to random/unpredictable lighting in the nursery may hinder the development of sleep and circadian rhythms and may adversely influence clinical outcome (5). It is hypothesized that regular lighting in the nursery will improve circadian rhythm development and thereby enhance clinical outcome. Indeed, earlier studies have shown beneficial clinical effects of cycled light in the nursery (6 -8). However, the shortor long-term influences of light on development of circadian rhythm were not examined in these studies. A prospective randomized study was initiated to address the hypothesis that cycled light before discharge may improve circadian organization and sleep compared with continuous dim lighting. METHODSPreterm infants who were admitted to our nursery at Lucile Packard Children's Hospital at Stanford were eligible. Exclusion criteria were short stay (Ͻ10 d) and transfer to another hospital, major congenital malformations, intrauterine growth retardation, grade 3 or 4 intraventricular hemorrhage, parenchymal injury including periventricular leukomalacia, prenatal infection, or substance abuse. When the clinical condition of an infant in the NICU was stable, he or she was transferred to the intermediate nursery and was randomly assigned to one of two groups: a dimly lighted room, the dim (control) group, or a day-night lighted room, the cycled (intervention) group. We assigned one room of our two-room intermediate care nursery to a continuous dim condition (dim room) in which the lighting remained low (below 20 lux) around the clock. The infant's incubator/bassinet was also covered by a nearly opaque blanket except during feeding or other interventions by parents and caregivers. This is the recommendation of the Neonatal Individualized Developmental Care Program (9), and during the time of this study, dim lighting 24 h/d was used as the standard practice at Stanford for all preterm infants. Infants in the cycled room also had their incubator/bassinet covered with the same type of blanket from 1900 h to 0700 h; however, the blanket was removed from 0700 h to 1900 h, at which time the room lighting was also turned up to standard lighting levels (approximately 300 lux) to produce a regular light-dark cycled condi-

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“…Third, the timing of the association found in this study, over the first 3 months of life, is consistent with prior reports of the progressive development of the circadian system in humans. Between 1-3 months of age, the circadian system gradually matures and organizes physiological and behavioral activity in a 24-hour cycle, including rest/activity, temperature, and hormone secretion (Glotzbach et al, 1994;McGraw et al, 1999;Rivkees, 2007;Shimada et al,1999). Fourth, mammals raised under varying photoperiods (short versus long days) during the postnatal period exhibit changes to the circadian system that are persistent and associated with future circadian adaptation, animal behavior, retinal function and the immune response (Brooks et al, 2014;Canal et al, 2009;Ciarleglio et al, 2011;Jackson et al, 2014;Pyter and Nelson, 2006;Smith and Canal, 2009;Weil et al, 2006).…”

Section: Discussionmentioning

confidence: 99%

Influence of light exposure during early life on the age of onset of bipolar disorder

Bauer

Glenn²,

Alda

et al. 2015

Journal of Psychiatric Research

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Emerging and entraining patterns of the sleep–wake rhythm in preterm and term infants

Cited by 58 publications

References 12 publications

Regulatory Problems in Very Preterm and Full-Term Infants Over the First 18 Months

Regulatory Problems in Very Preterm and Full-Term Infants Over the First 18 Months

Circadian and Sleep Development in Preterm Infants Occurs Independently From the Influences of Environmental Lighting

Influence of light exposure during early life on the age of onset of bipolar disorder

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