For many women, the correlation between sex and snoring is one of those annoying facts of life: The release of these brain chemicals during orgasm heightens feelings of bonding and trust between sexual partners, which may partially explain the link between sex and emotional attachment. What about the evolutionary reasons for post-sex sleepiness? There are many potential biochemical and evolutionary reasons for post-sex sleepiness, some direct and some indirect — but no one has yet pinpointed the exact causes. Follow Life's Little Mysteries on Twitter llmysteries.
One thing, however, is certain: The bottom line is this: What about the evolutionary reasons for post-sex sleepiness? A recent survey of 10, English men revealed that 48 percent actually fall asleep during sex. This confounds the long-held stereotype that men think about sex every seven seconds while awake, amounting to 8, times over an average hour day. Oxytocin and vasopressin, two other chemicals released during orgasm, are also associated with sleep. For unknown reasons, intercourse orgasms release four times more prolactin than masturbatory orgasms , according to a recent study. Dave Zinczenko, the author of "Men, Love and Sex: What is it, then, that spirals them into the land of nod? Oxytocin is also thought to reduce stress levels, which again could lead to relaxation and sleepiness. Their release frequently accompanies that of melatonin, the primary hormone that regulates our body clocks. The release of these brain chemicals during orgasm heightens feelings of bonding and trust between sexual partners, which may partially explain the link between sex and emotional attachment. Research shows that during ejaculation, men release a cocktail of brain chemicals, including norepinephrine, serotonin, oxytocin, vasopressin, nitric oxide NO , and the hormone prolactin. Talk about coitus interruptus! Although women sometimes feel sleepy after sex, the phenomenon does seem more pronounced in men. So in lieu of a cure, a better explanation will have to do. But perhaps since he cannot immediately run off with another woman anyway — damn that recovery time! There are many potential biochemical and evolutionary reasons for post-sex sleepiness, some direct and some indirect — but no one has yet pinpointed the exact causes. They put the new numbers down to previous studies, which they say were headline-grabbing but poorly set-up. They don't seem to have such a strong refractory period and may be asking for more when their partners just want a rest. In the group, 59 were randomly assigned to count how often they thought about food, 61 sleep and sex. Prolactin levels are naturally higher during sleep, and animals injected with the chemical become tired immediately. Follow Life's Little Mysteries on Twitter llmysteries. Then there is the biochemistry of the orgasm itself. The team, from Ohio State University recruited women and men aged 18 to 25 to monitor their thoughts. However, US scientists discovered that, on average, men still think about sex twice as much as women, who entertain the thought just ten times a day. By Melinda Wenner, Scienceline February 1,
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