There is no single, definitive scientific explanation for this age-old conundrum. But if you think about it long enough, the sex— sleep connection makes sense, particularly when you consider that many men have their first orgasms while unconscious. After orgasm, both men and women release the chemicals oxytocin, prolactin, gamma amino butyric acid GABA , and endorphins. Each of these contributes to that roll-over-and-snore feeling.
Why You Fall Asleep within Minutes of Having Sex
Why Men Fall Asleep after Sex | Men's Health
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Why Men Fall Asleep After Sex (and Women Don’t)
Do you know why when passionate encounters occur, men always seem to fall asleep immediately afterwards? For many women, the correlation between sex and snoring is one of those annoying facts of life: no matter when passionate encounters occur, men always seem to fall asleep immediately afterwards. The biochemical prolactin is released, physically altering his body and making him very tired.
Christopher Winter, M. Prolactin suppresses dopamine—a stimulating neurotransmitter that makes you feel awake, he explains. And your body releases it in spades when you come. When that happens, the hormone melatonin ignites your sleep cycle.