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Rapid eye movement (REM) in premature neonates and developmental outcome at 6 months
Hadar Arditi-Babchuk1, Ruth Feldman, Arthur I Eidelman
1Department of Psychology and the Gonda Brain Research Center, Bar-Ilan University, Ramat-Gan, Israel.
Insights
Premature infants with low rapid eye movement (REM) sleep showed poorer cognitive development at 6 months. Low REM sleep may indicate developmental risk in neonates.
Area of Science:
- Neonatal development
- Sleep science
- Developmental psychology
Background:
- Early sleep patterns in premature infants are linked to later developmental outcomes.
- Rapid eye movement (REM) sleep is a critical component of early neurodevelopment.
Purpose of the Study:
- To examine the relationship between REM sleep in premature neonates and their developmental outcomes at 6 months corrected age.
- To identify potential early indicators of developmental risk in premature infants.
Main Methods:
- Sleep-wake states and REM activity were recorded for 81 premature infants (32-36 weeks post-menstrual age) over 4 evening hours.
- Developmental outcomes were assessed at 6 months using the Mental Development Index (MDI) of the Bayley Scales of Infant Development II.
Main Results:
- Infants with lower REM activity spent more time in non-optimal states like crying and unfocused alertness.
- Lower REM activity was associated with significantly lower MDI scores at 6 months corrected age.
- These findings were consistent regardless of neonatal medical risk factors.
Conclusions:
- Low REM sleep in premature neonates may be an early indicator of potential developmental risk.
- Monitoring REM sleep could aid in identifying infants who may benefit from early developmental interventions.
- Understanding sleep organization is crucial for optimizing outcomes in premature infants.
Abstract:
Different aspects of early sleep organization have been associated with subsequent development in premature infants. The aim of the present study was to assess the relations between rapid eye movement (REM) activity in premature neonates and infants' developmental outcomes at 6 months. Participants were 81 premature infants (47 males). Sleep-wake states and REM were observed across 4 consecutive evening hours (7-11 PM) in 10-s frames when infants were between 32 and 36 weeks post-menstrual age. Developmental outcome was assessed at 6 months with the mental development index (MDI) of the Bayley II. Infants with low-REM activity spent more time in less growth-promoting states, including crying and unfocused alert states in the neonatal period and had lower MDI scores at 6 months corrected age compared to infants with high-REM. Differences between the high- and low-REM groups were independent of neonatal medical risk. Low-REM activity may serve as an indicator of developmental risk among premature neonates.
