Why Men Fall Asleep After Sex

The Male Brain Just Wants to Turn Off After the Rest of the Body Has Its Fun

On behalf of ladies everywhere, let us just say, thanks science … you've now provided men with a concrete excuse for why they just want to roll over and fall asleep after getting their freak on.

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A study released by a French medical group reveals that men don't choose to fall asleep after sex; it's the way their brains work. After sex, parts of their brain are designed to shut down, which deactivates the rest of the brain from sexual desire.

The study's results, reported in the U.K. Daily Mail, were obtained by monitoring the male brain via scans before and during orgasm (how romantic that must have been).

Read: Why Women Lose Interest In Sex Before Men

Not only did researchers find that the brain wants to shut down dudes' sexual desires, but post-sex, chemicals like oxytocin and serotonin are released into the male brain and can add a "powerful sleep-inducing effect."

"These experiments give us the first hints as to what happens in the brain during orgasm," said neuroscientist Serge Stoleru. "After men have an orgasm they usually experience a refractory period when they cannot be aroused.

"For women it seems to be different. They don't seem to have such a strong refractory period and may be asking for more when their partners just want a rest."

Thanks to you, too, Mother Nature.

Stoleru and company's research also showed that most men do feel relaxed after sex, with 80 percent saying they were able to drift off to sleep with no problems after sex.

Read: The Most Common Sex Mistakes Men Make

But a more disturbing number also emerged at The Vitality Show, Europe's largest health and beauty gathering, the Daily Mail reports.

A survey of 10,000 adults revealed that 48 percent of men also said they had fallen asleep during sex.

And "science" isn't going to save you in that situation, fellas.