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While the lore goes that men morph into hibernating grizzlies 10 seconds after sex, it’s not totally unheard of for you to feel like snoozing too. “When you orgasm, several hormones are released that have a relaxing effect,” say ob-gyn Lee Ellen Morrone, MD. So that crazy rush of oxytocin and vasopressin that come along with your O is probably what’s making you all sleepy-bear too. Or depending on the friskiness of your sex, it could just be that your body is beat. “If you’re using muscles you don’t typically use, sex can be an intense workout,” Dr. Morrone says. Either way, it doesn’t mean that the sex was so boring, it lulled you both into a deep slumber. In fact, it probably means that the sex was amazzzzzzz-ing…and that you’re bound to have some sweet, sweet dreams.