Morning wood otherwise known as pitching a tent with the blankets in the morning is a natural occurrence in men that involuntarily happens during REM sleep.
An erection typically happens during a state of arousal, the guy sees, feels or hears something that turns him on and his brain sends a signal to the penis that is show time filling the penis with blood and causing an erection.
Since this is a response to a form of stimulus, some people may be confused on why do guys get morning wood since there is no stimulus happening for the brain to react to while he sleeps.
Though there is no 100% proven reason behind why do guys get morning wood there are multiple theories.
Though the least common reason, morning wood happens during the REM phase of sleep which is also when dreams happen. A guy could have been having a dream that caused him arousal and an erection. Since our dreams feel real when we are having them our brain believes that it is experiencing that threesome or night out with Megan Fox, so it signals to the penis and an erection happens.
If it is a dream why guys are still erected when they wake up? Fair question, This is because most people wake up during REM sleep, so if you were aroused during the dream when you wake up in the middle of a dream you will still have the physiological effects that you were experiencing in the dream.
During the night your bladder continues to fill. As the bladder fills it expands and can interact with regions of the spine. The sensation of the bladder interacting with parts of the spine sends a sensation that can cause what is called a reflex erection.
Though not the main reason for erections, testosterone is one of the contributing factors for an erection. Throughout the day a man’s testosterone level fluctuates with the testosterone levels peaking in the morning. With the peak in testosterone a man will feel certain effects attributed to testosterone like energy or aggression and he will feel physical effects such as morning wood.
During REM sleep the body performs multiple tasks one of these task is the maintenance. A guy will experience multiple erections throughout the sleep cycle and is the body’s way of testing and exercising the penis. This is why one of the tests for erectile dysfunction is to see if a guy gets morning wood. If he doesn’t this is a sign of a physical problem rather than a psychological problem.