Why do we (men) feel sleepy after an orgasm?

It's a combination of fatigue, hormones, and blood circulation. The energy level during sex is so high that when it's over, there's a sort of energetic shut down. Also, sex draws a lot of blood to your genital area, so it takes a while for the blood to redistribute, and anytime your brain is a little blood starved (oxygen starved) it causes sleepiness -- just like after a big meal, where the blood rushes to your stomach and digestive track.

im a girl and i also feel very sleepy after an orgasm. to make this short and sweet, an orgasm makes your heart beat faster causing you to be tired.

Orgasm in men releases & drains 3 neurotransmitters: Serotonin, Norepinephrine & acetylcholine, not to mention it drains the weak electric current in the man's nervous system. Would you wonder that the man gets tired???

Because having an orgasm is about the equivalent to running a mile. While it won't cause you to lose any excess weight, it will tire you out pretty fast.

Cheers!

Because your drained. Women feel the same if they have an orgasm, but the majority of women don't. Shame on you men.......

you release a hormone that causes your body to feel tired and sleepy. its a natural thing that happens on its own and for good reason......(i believe its so that a woman can have time to cuddle up next to you and have her bonding time after the sex) Gods natural way of making sure a man couldnt get away afterwards. lol

I think it is a natural reaction to just having had a humping session and the body then has time to recover for the next session five minutes later.

because we suck out all the energy from you guys ;)

don't worry if you were really good then we get sleepy too

Sexual activity burns calories, dude! It's a workout...all that pumping...thrusting...sweating up a storm.

i be sleepy and thirsty right after i usally have to go twinkle