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When a man is sexually stimulated by sight, thought, or touch, the brain sends signals that relax the smooth muscles around the arteries that supply blood to the spongy and cavernous bodies. The veins draining the bodies can't keep up, resulting in swelling. As the swelling reaches the limit of the penile skin, the penis becomes firm. The pressure of the spongy and cavernous bodies against the skin partially closes the veins, helping to maintain the erection. Erection continues until the signals from the brain stop, but erections are not consistent; waking and waning are normal, even during intercourse. Erection can occur throughout life, happening before birth and into the 90's in healthy men. Nocturnal erections occur during all male dreams (regardless of what the dream is about), unless the man has physical problems (this is the easiest way to determine if impotence is physical or emotional in nature). The so called "morning erection" is the result of being wakened during, or just after a dream; and it can be a very persistent erection. While a morning erection is not a sign of arousal, it's presents and the pleasurable sensations it can create may result in arousal.
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