Research by evolutionary psychologists at the University of Michigan and Albright College in Pennsylvania, found the tendency to drop off to sleep first after sex is associated with greater partner desire for bonding and affection.
Daniel Kruger, a research fellow at the University of Michigan, and lead author of the study, said: “The more one’s partner was likely to fall asleep after sex, the stronger the desire for bonding.”
The study was published in the Journal of Social, Evolutionary, and Cultural Psychology.
Participants then indicated “who falls asleep after sex?” and “who falls asleep first when going to bed not after sex”.
Participants whose partners nodded off immediately after sex had stronger desires for post-coital cuddling and chatting.
“Falling asleep before one’s partner may be a non-conscious way to foreclose on any commitment conversation after sex,” says co-author Susan Hughes, associate professor of psychology at Albright College in Reading, Pennsylvania.
The study also looked at who were more likely – men or women – to fall asleep first.
“Perhaps men stay awake longer as an artifact of mate guarding – making sure the woman doesn’t leave them for another partner,” says Susan Hughes.
“Men may also stay awake longer in an attempt to entice their partner into having sex.”
Research on post-coital behaviors are few, the study authors say.
“The vast majority of the research on the evolutionary psychology of human reproduction focuses on what’s before and leading up to sexual intercourse,” says Susan Hughes.
“But reproductive strategies don’t end with intercourse; they may influence specific behaviors directly following sex.”
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