Why do men want to sleep after sex

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Haven’t you wondered why men want to flip over and snooze after sex while, often, women are even more amped, ready to clean the room. Pre-ejaculate men are different from post-ejaculate men neurologically and biochemically.

Parasympathetic nervous system

Before ejaculation a man is parasympathetic dominant. What? Sympathetic to who? No, no, not as in having sympathy for someone else. The parasympathentic nervous system is the part of the autonominic nervous system that is responsible for stimulation of activities that occur when the body is at rest, including sexual arousal, salivation, tearing, urination, digestion and defecation. It is the opposite of the sympathetic nervous system when you feel alert and ready to run (fight –or-flight.) In order to get and maintain an erection a man needs to be on “para mode.” That’s why guys who are too nervous and anxious have a harder time (no pun) getting and staying hard.

Biochemistry after ejaculation

After ejaculation men release a cocktail of brain chemicals that induce somnolence:  oxytocin, prolactin, gamma amino butyric acid (GABA) and other hormones all contribute to “that roll-over-and-snooze feeling” because they facilitate sleep. You probably know oxytocin and prolactin as women hormones: Oxytocin is a hormone that help women with uterine relaxation for delivery of babies and prolactin helps with the production of milk in breast feeding mothers. Although it is not completely clear what these two hormone’s do for men, they seem to have a post-ejaculatory role: Prolactin levels are naturally higher during sleep, and animals injected with the chemical become tired immediately. This suggests a strong link between prolactin and sleep, so it’s likely that the hormone’s release during orgasm causes men to feel sleepy. This probably explains why men are sleepier after intercourse than after masturbation. For unknown reasons, intercourse orgasms release four times more prolactin than masturbatory orgasms, according to a study (Kruger et al. 2002).   Oxytocin and vasopressin, two other chemicals released during orgasm, are also associated with sleep. Their release frequently accompanies that of melatonin, the primary hormone that regulates our body clocks. Oxytocin is also thought to reduce stress levels, which again could lead to relaxation and sleepiness.


Now you can provide an explanation to your partner. Good luck 😉

In Optimal Health,


Dr. Geo

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by Dr. Geo

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