Increased infant axillary temperatures in non-REM sleep during mother-infant bed-sharing

This study addressed the effect of mother-infant bed-sharing on infant body temperature and possible mediating mechanisms. Axillary temperatures were recorded for the entire night in 26 infants on both a bed-sharing night and a solitary sleeping night, accompanied by polysomnography and video-taping to allow assignment of sleep stages and behavioral analysis. All infants w ere approximately 3 months old, healthy, Latino and breast-feeding; 16 of t he infants bed-shared since birth while the others routinely slept alone. B ed-sharing was associated with a significantly increased mean axillary temp erature compared to solitary sleeping in both routine bed sharers and routi ne solitary sleepers. This increase was expressed only in non-REM sleep, wi th no differences during REM sleep or waking. The increase in temperature d uring bed-sharing may be related to an increased frequency of transient, mo vement-associated arousals during bed-sharing. (C) 1999 Elsevier Science ir eland Ltd. All rights reserved.