Mother-infant bedsharing is associated with an increase in infant heart rate.

@article{Richard2004MotherinfantBI,
  title={Mother-infant bedsharing is associated with an increase in infant heart rate.},
  author={C A Richard and Sarah S. Mosko},
  journal={Sleep},
  year={2004},
  volume={27 3},
  pages={
          507-11
        }
}
OBJECTIVES We hypothesized that mother-infant bed sharing, compared to solitary sleeping, would be associated with higher infant heart rates. The objective was to compare infant heart rates between the 2 environments and, secondarily, to test for relationships between heart rate and other, previously reported, differences in the same infants. DESIGN Heart rate was measured in 15 infants over a bed-sharing night and a solitary-sleeping night. Eight of the 15 infants routinely bed shared with… 

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