LOGITUDINAL STUDY ON INFULENCE OF CHILD REARING ENVIRONMENT TO DEVELOPMENT OF SLEEP AND BEHAVIOR IN PREMATURE INFANTS.

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The purpose of this study were to investigate (1) longitudinal influence of constant light in neonatal care unit to biological rhythm and behavior in childhood of preterm infants, and (2) devlopmental retardation of sleep-wake rhythm in preterm infants who admitted in neonatal care unit with constant light in the long term onward 44 corrected weeks. As results, 44 preterm infants caught up in a given postnatal period, to show no differences in sleep-wake rhythm, circadian rhythm of saliva cortisol, and behavior development in childhood, from 40 term infants in the same postnatal 2 to 4 year of age.We first found also that the 8 preterm infants in neonatal intensive care unit had significant smaller wakefulness time than 44 preterm infanrts who had discharged from there around 40 corrected weeks, and that they slept longer in day time than in night. They indicated difficulty in entrainment of diurnal rhythm in neonatal care unit.