by 
Massey
ANSWERS: 19
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When you're asleep at night you unconsciously hold your water unless it becomes a dire emergency. Notice how in the morning one of the first things we do is empty our bladders. And immediately after that your "wood" starts to wilt. The bladder is no longer pressing against the nerves and especially the blood vessels that make you have that morning wood.
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Wood is a slang term of having an erection. A full bladder pressing against both the nerves and blood vessels that control erections is what caused "morning wood" How's that for clarity?
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All men, except for those with erectile dysfunction, have erections while they sleep. These erections keep the equipment functioning properly and typically happen during the dream stage of sleep. If a man wakes up directly from the dream stage of sleep, then he will likely wake up with an erection, or morning wood, or morning glory. Whatever term you prefer. Doctors use the fact that men normally have erections while sleeping to determine whether impotence (the inability to have an erection) is physical or psychological. If a man doesn't have erections while sleeping, then his impotence is physical. If he does have erections while he is sleeping, then his impotence is psychological.
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A morning erection that is naturally caused as the brains enters the REM-deep sleep phase. At this stage, the body's skeletal muscle structure relaxes and causes hypervasodilation in the capillaries of the body, resulting in said erection.
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In response to pointeman1. Your answer is flawed by it's very language. By the fact that having an errection in the first place depends on a large increase in blood circulation through the penile capilairies,and as stated the full bladder would press on the very source of blood flow required to acheive an errection, it would seem that one would inhibit the other. During REM stage of sleep two contributing factors occure. 1:Capiliaries open up to feed muscles durring an excited state also increasing blood flow through the penile circulatory system, and 2: increased nerve stimulation as well stimulates the morning wood.the fact that just about every one has to piss in the morning is mutually exclusive of the fact that healthy men get a hard when they sleep and may wake up with one
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"There is increasing evidence that the neurophysiologic processes that control nocturnal penile tumescence (NPT) are androgen-sensitive. Several studies have shown that sleep-related erections, which are usually impaired in hypogonadal men, are restored by exogenous testosterone" Source: http://www.questia.com/googleScholar.qst;jsessionid=GgpRgY7s3qXQdK1W0YqxhBGHcz10TLhpZb8gpGQ7mTQGD1VnhlmN!-1791932064?docId=5000192469 Other information about this issue: http://en.wikipedia.org/wiki/Nocturnal_penile_tumescence
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Urine kills the sperm, that's why we pre-ejaculate, to clear the tube for the sperm. While having an erection, a valve closes off preventing more urine from entering. When you are awake, you have control over your bladder, You lose this control while sleeping. I believe that our bodies keep us from wetting the bed by maintaining an erection and closing off the valve. You can force the vale open by pushing hard enough. Try it next time you wake up with morning wood, urinate, and feel that valve being forced open. and then the erection is gone within seconds. I wake up 2-3 time throughout the night having to do this, if I don't urinate, the erection almost never goes away and I can't get back to sleep.
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I cause morning wood ;-P
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I think is has something to do with the sun rising, some type of gravitational pull.......
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Me. I cause morning wood.
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It is a built in restraint system created to keep me from rolling off of the bed while in REM sleep. It kind of works like "the boot" when you don't pay your parking tickets.
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Erections are caused by increasd blood flow to the penis. When you start to wake up you take deeper breaths and yawn increasing your heart rate that in turn increases your blood flow to every part of your body and you get moarning wood. Most of this happens when you are still half asleep so you don't notice it. I have had what could be called "bedtime wood." Time to go to sleep, start yawning and you end up with an erection that feels like it could break rocks. Both of witch come from increasd oxygen and an increased heart rate from yawning. So yawning causes moarning wood.
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My expirence is that it prevents me from pissing the bed. Its my body's way of cutting off ability to pee, when I can't control it at night. Even though, I'd rather think its because of the hot secertary at work I was banging in my sleep!
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The wettest dream u had last night :D
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A really good dream....;)
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Pokemon
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The full bladder explanation is old misinformation. The REM sleep and testosterone level explanations are supported by recent research.
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dreams ;)
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I have a question regarding this. Why is morning wood harder than when im awake? Is it that there is so much blood and oxygen concentrated there for a prolonged period of time that it has had the chance to reach this state of hardness. It is just my thought as I dont know.
Pointeman1 
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