Some men can experience erections without any sexual stimulation (reflexogenic erections). This is known as reflexive erection. Reflexive erections occur when there is no physical or mental...
Some men experience a "morning erection" due to increased blood flow during REM sleep. This phenomenon is common and natural. The body naturally produces testosterone hormones that increase blood...
Morning erections occur when you wake up with an erection. They usually happen during the transition between REM sleep and being awake. REM is the deepest stage of sleep and occurs every 90 minutes...