Cuddling during sleep doesn’t come without a cost the mice often disrupt each other’s sleep The mice were willing to forgo their preferred sleep location to gain access to social contact. This suggests that the motivation for prolonged physical contact drives huddling behavior, the researchers say. co-sleeping individuals show synchronization in multiple neurophysiological measures, including the timing of sleep-wake onset and REM sleep. In the study, the researchers used advanced wireless devices and video recordings to simultaneously monitor multiple mice within a group for 24 hours.
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