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The question is why do men feel sleepy? And this is primarily men after orgasm. There’s some women who also feel sleepy, but in general, more men. So the sexual response cycle starts with desire, advances to, peripheral genital swelling as blood flows to the genitals. Sexual tension develops. And then orgasm occurs. To stop the orgasm, the body releases serotonin as its way of now inhibiting the sexual response. So resolution occurs. Elevated serotonin is how you go to sleep. If you take a sleep medication like Zolpidem, a trade name is Ambien. Ambien works by raising serotonin. So part of the reason why men sleep is because their resolution of the orgasm response is through an elevation of serotonin.