But there are a lot of reasons people fall asleep after sex, and it doesn't necessarily mean a partner is uninterested.
As the body receives this signal, another hormone called melatonin starts doing its job which is to initiate the sleep cycle.
In addition to oxytocin, men and women release vasopressin, prolactin, serotonin, nitric oxide, and endorphins, according to Costa.
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Studies have also found that in opposite-sex couples who share a bedmen are more likely to disturb their mates.
Description: Do you think women experience more sleep-related issues? Their release frequently accompanies that of melatonin, the primary hormone that regulates our body clocks.