Discussion Forum. I have been assured, many times, by well-meaning men and women, that ejaculation can never result in tiredness. These well-meaning people have also assured me that if there is any resulting tiredness it is purely psychological, and that to deal with such tiredness or exhaustion one would need to explore it in a psychotherapeutic setting. My present response to such statements is a gentle smile. Since the very beginning of my sexual activity at the age of eleven, I have experienced tiredness, or even exhaustion, after ejaculation. The tiredness was sometimes so extreme that it blighted my otherwise wonderfully pleasant sexual experience.
After sex it is very common for men to feel tired or even fall asleep on their partners. There are a set of specific reasons as to why this tiredness occurs. In most cases it is a combination of exerting a lot of physical energy during sex as well as the chemicals that are released when the act is complete and orgasm is achieved. Although not every man will feel tired after sex, most do report feeling more relaxed. When a man orgasms, prolactin is released — a hormone that is linked to feelings of sexual satisfaction. The primary reason a man feels tired after sex is due to the fact that prolactin causes sleepiness and drowsiness.
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. So in lieu of a cure, a better explanation will have to do. Although women sometimes feel sleepy after sex, the phenomenon does seem more pronounced in men.
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.