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Should Neonates Sleep Alone?

  • Barak E. Morgan
    Correspondence
    Address correspondence to Barak E. Morgan, Ph.D., MBBCh, University of Cape Town, Department of Human Biology, Medical Imaging Research Unit, Anzio Road, Observatory, Western Cape 7925, South Africa
    Affiliations
    MRC Medical Imaging Research Unit, University of Cape Town, Western Cape, South Africa

    Department of Human Biology, University of Cape Town, Western Cape, South Africa
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  • Alan R. Horn
    Affiliations
    Department of Paediatrics, University of Cape Town, Western Cape, South Africa
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  • Nils J. Bergman
    Affiliations
    Department of Human Biology, University of Cape Town, Western Cape, South Africa

    Department of Paediatrics, University of Cape Town, Western Cape, South Africa
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      Background

      Maternal-neonate separation (MNS) in mammals is a model for studying the effects of stress on the development and function of physiological systems. In contrast, for humans, MNS is a Western norm and standard medical practice. However, the physiological impact of this is unknown. The physiological stress-response is orchestrated by the autonomic nervous system and heart rate variability (HRV) is a means of quantifying autonomic nervous system activity. Heart rate variability is influenced by level of arousal, which can be accurately quantified during sleep. Sleep is also essential for optimal early brain development.

      Methods

      To investigate the impact of MNS in humans, we measured HRV in 16 2-day-old full-term neonates sleeping in skin-to-skin contact with their mothers and sleeping alone, for 1 hour in each place, before discharge from hospital. Infant behavior was observed continuously and manually recorded according to a validated scale. Cardiac interbeat intervals and continuous electrocardiogram were recorded using two independent devices. Heart rate variability (taken only from sleep states to control for level of arousal) was analyzed in the frequency domain using a wavelet method.

      Results

      Results show a 176% increase in autonomic activity and an 86% decrease in quiet sleep duration during MNS compared with skin-to-skin contact.

      Conclusions

      Maternal-neonate separation is associated with a dramatic increase in HRV power, possibly indicative of central anxious autonomic arousal. Maternal-neonate separation also had a profoundly negative impact on quiet sleep duration. Maternal separation may be a stressor the human neonate is not well-evolved to cope with and may not be benign.

      Key Words

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