There are many popular answers on male sleepiness after sex, most of which focus on exertion and relaxation.
Dr. Patti Britton (undated) on iVillage,
S Thompson (2006) on AssociatedContent, and even the book
'Why Do Men Fall Asleep After Sex? (Leyner and Goldberg, 2006)*. However, scientific publications on the subject appear to be sparse.
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