Why do guys always have a 'hard on' when they wake up?

1. HAHAHHAHAHAHAH. yes... cus we want to have SEX> if we had the sex the night b4, we shoudnt have it. not really a horny dream,. it doesnt matter wut dream we have. althought im not sure cus im only in highschool..LOL

2. All males get erections when they dream, or should if everything is working. It really does not matter what the dream is about, you'll just get some wood. And it happens to us all from infants to the elderly.

3. All erections in human males come from increased blood flow, unlike other species, there is no bone to support it. This increase in blood occurs when muscles holding the blood back relax, The muscles are there to maximize supply to other areas, and prevent any hindrance the erection would cause, as well as there function in intercourse. Obviously when a person is asleep their muscles tend to relax, some people more so, and often, than others. "Horniness" often arises after the erection and not always before, in that it reminds men to think about these things. This is part of why some foods which relax the muscle, such as sugar e.g. in bananas and honey are considered aphrodisiacs. Woman are aroused as often, and easily, as men based upon study of response to naked pictures of the opposite sex, just men are overtly aware of it more, because of the pressures in, and upon, the penis is so obvious. Some people who have frequent erections are developing poor health, as evidenced by the lack muscle strength. After this degeneration reaches clinical conditions, the blood flow itself is impaired, and erections become impossible without heart medication such as Viagra, or pumps etc. I do not recommend too much dwelling on any subject which will not keep you healthy, and of benefit to the whole of your world unbiasedly. Sexual issues, and all other habitual compulsions current take up more of people's time than is ideal. Though they should not be all shunned (far be it), they should not be over emphasized either. Only those things deleterious to the mind and body should avoided, and/or overcome, such as drug addictions, as much as possible. Everything else should be used in its place for a healthy personal life and society, including sexual intercourse, nothing to excess. God bless.