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Emergence of the circadian sleepwake rhythm might depend on conception not on birth timing
Sleep and Biological Rhythms, 06/01/09

Takaya R et al. - Developmental changes in the sleep-wake rhythm of preterm infants were compared with those of full-term infants, to clarify the timing of the developmental change of the sleep-wake rhythm and its dependence on either conception or birth timing...The first group (pattern A) showed little evidence of any circadian component. The second (pattern B) had a prominent circadian component. The last (pattern C) was characterized by its prominent circadian peak and a negative peak in about a 12-h cycle, which represented very little daytime sleep. There were no differences in the sleep-wakefulness patterns of full-term infants and preterm infants when the authors compared their sleep log data using postmenstrual age. Almost all of the infants in both groups changed their patterns from A to B around the 46th week. Considering these findings, these changes in the circadian rhythm of sleep and wakefulness were viewed as showing dependence on conception rather than on birth timing.

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