Why do men feel sleepy after sex?Men feel sleepy after sex because of the exercise, orgasms are reached when you let go of "all fear and anxiety" -this relaxes the body.
Men release norepinephine, serotonin, oxytocin, vasopressin, nitric oxide (NO), and the hormone prolactin. Prolactin makes you tired (even stronger while intercourse than for masturbation prolactin is realeased for times more)
Oxitocin and vasopressin are also associated with sleep and bonding (feeling of closeness with the sexual partner) http://www.squidoo.com/fun-facts-about-sleep
Treefrogs do sleep with their eyes closed during the day. They have an upper and lower eyelid and a semi-transparent nictitating membrane or 3rd eyelid. Bullfrogs and horned frogs (pacman frogs) also have upper and lower eyelids. They can and do close their eyelids when sleeping. Many frogs are diurnal and they don't sleep during the day. That may be why you don't see them close their eyelids and go to sleep. The pupil can respond to light and get smaller in frogs as it does in other animals.
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