Morning erections happen during REM sleep and are normal, reflecting healthy circulation and hormones.
Why
Nocturnal erections happen 3 to 5 times a night during REM sleep. Waking in one is “morning wood”.
Causes
- Higher morning testosterone.
- REM sleep.
- Lower stress hormones.
Is it healthy
Yes. It shows healthy circulation and nerve function.
See a doctor
If you stop having them, as it may signal an underlying condition.
Nocturnal erections
Morning erections are the continuation of nocturnal penile tumescence that occurs during REM sleep, typically 3 to 5 times a night. They are most noticeable when waking up from a REM period.
What causes them
During REM sleep, the brain turns off the norepinephrine signals that normally keep the penis flaccid, while increasing nitric oxide and parasympathetic signals that increase blood flow. Testosterone levels peak in the morning and facilitate erections.
Not sexual dreams
They do not require erotic dreams. They occur in infants and in men of any age.
Full bladder myth
A full bladder can add to the reflex through pressure on nerves in the sacral region, but is not the main cause.
Health meaning
Regular morning erections show that the nerves, blood vessels and hormones are working. Men who suddenly stop having them may have a physical issue like low testosterone, diabetes, cardiovascular disease, sleep apnea or medication side effects.
Frequency by age
They decline with age but often continue into the 70s.
Women
Women also experience clitoral engorgement during REM sleep.
Management
Erections usually subside on their own within minutes after waking. Emptying the bladder, moving around or taking a cool shower can help.
Medical situations
Prolonged and painful erections lasting more than four hours (priapism) require emergency treatment. Painful erections at night can be related to certain conditions such as sickle cell disease.
See a doctor if
Morning erections vanish with erectile problems, low desire or fatigue. A doctor can check hormone levels and cardiovascular risk. Erectile dysfunction can be an early warning of heart disease.
Normal biology
Nocturnal penile tumescence occurs during REM sleep several times per night, about 3 to 5 erections lasting 20 to 30 minutes in healthy males, from infancy to old age. It is linked to changes in nerve activity and testosterone and is not necessarily connected to sexual dreams. Morning erections are a sign that blood flow and nerve function are generally working.
Health signals
Absence of morning erections together with erectile dysfunction may suggest low testosterone, diabetes, vascular disease, medication effects, depression or sleep apnea. A urologist may check blood pressure, glucose and hormones. Lifestyle factors like smoking, alcohol, obesity and inactivity affect erectile function.
Based on data from the Mayo Clinic and the American Urological Association
