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Why Do Men Wake Up with 'Morning Wood'? — VIDEO


The guys at ASAP Science are back to answer a burning physiological question about why guys frequently pitch a tent in the morning even without knowing anything about camping.


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  1. Excellent explanation for it all. Except, the whole aiming-correctly-when-peeing thing is still an enigma with morning wood.

    Posted by: Drew | Nov 14, 2012 10:49:34 AM

  2. Great info, but if that is how we picture our morning wood tent, we are all wishful thinkers.

    Posted by: andrew | Nov 14, 2012 11:11:38 AM

  3. It's about not peeing your bed. Funny that most guys probably don't know this. I learned that in a 7th or 8th grade biology class.

    Posted by: ratbastard | Nov 14, 2012 11:26:05 AM

  4. Someone has to say it.

    Speak for yourself Andrew.

    Posted by: Mike in the Tundra | Nov 14, 2012 11:27:59 AM

  5. "mmmmmm husband's morning wood .... mmmmm" :-)

    Posted by: OS2Guy | Nov 14, 2012 11:33:48 AM

  6. @Mike In The Tundra: Lucky you!!! Unfortunately, mine is just a pup tent.

    Posted by: andrew | Nov 14, 2012 11:35:55 AM

  7. If there's a correlation between tent size and masculinity then I can't wait for the circus to come to town. Clowns notwithstanding.

    Posted by: Anastasia Beaverhausen | Nov 14, 2012 11:51:46 AM

  8. this is all fine until i fall asleep on a plane or in a car with friends on long trips. i'm always so paranoid that i sleep with my jacket over my lap. :)

    Posted by: bostonbeat | Nov 14, 2012 12:51:16 PM

  9. OS2 - send us a picture, all your blabbing about your big husband calls for verification. And...of course I'm envious.

    Posted by: UFFDA | Nov 14, 2012 1:32:41 PM

  10. And remember, never waste a hard-on ;-)

    Posted by: Onnyjay | Nov 14, 2012 1:40:07 PM

  11. @Bostonbeat, why worry? lol. If you inadvertently are giving others a show, you can't be held accountable and it might perk up someones mood :)

    Posted by: Luke | Nov 14, 2012 2:08:28 PM

  12. Is that why they're called "Lumberjacks"?

    Posted by: Anastasia Beaverhausen | Nov 14, 2012 3:56:13 PM

  13. They should have mentioned that morning wood or lack thereof is important information in the diagnosis and treatment of sexual dysfunction.

    Posted by: BobN | Nov 14, 2012 4:13:20 PM

  14. Be thankful you still have them. At a certain age, you star wondering out loud that - yes, Love is nice, but 9 out of 10, a Hard-on is more dependable.

    Posted by: Manny Espinola | Nov 14, 2012 9:35:43 PM

  15. When your my age... it's called hardening of the arteries!

    Posted by: Jerry Pritikin aka The Bleacher Preacher | Nov 15, 2012 3:55:43 AM

  16. There's actually a test they do for guys who are having trouble getting erections, they put a little paper ring around the penis before sleep to see if nocturnal erections occur. If the paper is busted in the A.M., your willy is a-o-k. Which means the problem is all in the big head, not the little one.

    Posted by: johnny | Nov 15, 2012 7:43:01 AM

  17. As a college freshman, I was in a study at the university's med school. For two weeks, we reported to hospital rooms for a sleep study. Sensors were attached to various parts of our bodies including an elastic loop under the scrotum and around the base of the penis. This measured the number of erections each night. Participants in the study soon turned it into a competition, bragging about who had the highest number each night.

    Posted by: JONNY NYNY2FLFL | Nov 16, 2012 8:37:26 PM

  18. It's called plethysmography, specifically of the penile and scrotal appendages. During the period leading up to full tumescence, the sensors detect changes in volume register the signal. The specific type and modality of the sensor and theory of operation can vary. This specific application has been in use for more than 55 years.

    Posted by: J. Smith | Nov 24, 2012 10:22:02 AM

  19. Well I wanna know why morning wood erections are harder and stiffer than than any of my other erections? I don't get that hard having sex or masturbating... hmmm

    Posted by: James | Dec 6, 2012 11:53:18 AM

  20. James it may be a mental problem since physically based on your morning wood you are fine. Are you a frequent porn watcher? If so that may be the issue, take a 2 week break from it and see if it changes

    Posted by: Alex | Dec 22, 2012 3:59:42 PM

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