Editorial
Written byMen's Health Istanbul Editorial Team
Medical reviewer (awaiting sign-off)Prof. Dr. Ateş Kadıoğlu
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The short answer
Morning erections are the last of several erections that happen naturally during sleep, mostly in the dreaming (REM) phase. They do not depend on arousal, so they are a rough sign that the blood vessels, nerves and hormones involved in erections are working. Having fewer of them now and then is normal, especially after poor sleep, alcohol or illness. A steady loss of morning erections over months, particularly alongside difficulty with erections during sex or low desire, is worth mentioning to a doctor, because it can point to a physical cause such as blood vessel changes or low testosterone.
Key takeaways
- Erections during sleep happen several times a night, mainly in REM sleep, and are not linked to sexual thoughts.
- Regular morning erections suggest the physical machinery of erections is broadly working.
- Occasional absence is normal; a steady decline over months is worth raising with a doctor.
- In a large European study, poor morning erections were one of the sexual symptoms most linked with low testosterone.
What causes morning erections?
Most men have several erections every night without knowing it. They happen mainly during REM sleep, the stage of sleep in which most vivid dreaming takes place, and each can last a while before fading. Sleep moves through several cycles a night, and REM periods tend to get longer towards morning.
So the erection you notice when the alarm goes off is usually just the last of the night's sleep erections, caught because you woke up during or shortly after it. Doctors call these nocturnal penile tumescence, which simply means swelling of the penis at night.
Crucially, they are not caused by sexual dreams or desire. They are produced by the brain's own sleep machinery, which is why they are useful to doctors.
What do morning erections say about your health?
An erection needs several systems to work together: nerves that send the signal, blood vessels that widen and fill, smooth muscle that relaxes, and hormones in the background. Sleep erections use the same systems, but without the pressure, nerves or distraction that can get in the way during sex.
That makes them a rough, informal check. If a man has regular firm erections on waking, the physical parts are probably broadly working. If they have faded steadily, it is more likely that something physical, such as reduced blood flow, is involved.
It is only a clue, though. Having morning erections does not rule out a physical problem, and not having them does not prove one.
Why have my morning erections stopped?
There are everyday reasons for fewer morning erections, and more significant ones.
- Sleep. Short, broken or poor-quality sleep means less REM sleep, and fewer chances to wake during an erection. Sleep apnoea and shift work can both play a part.
- Alcohol and some medicines. A heavy evening, some antidepressants and some blood pressure medicines can reduce sleep erections.
- Age. Sleep erections tend to become less frequent and less firm with age, as do erections generally.
- Blood vessel health. Smoking, diabetes, high blood pressure and raised cholesterol affect the arteries of the penis. A gradual loss of morning erections can be one of the first signs.
- Hormones. Testosterone plays a supporting role in erections and desire.
Are morning erections linked to testosterone?
They can be. The European Male Ageing Study, published in 2010, looked at symptoms and hormone levels in men aged 40 to 79. Of the sexual symptoms examined, poor morning erections, low sexual desire and erectile dysfunction were the three most closely linked with low testosterone.
The same study found that true late-onset hypogonadism, meaning those symptoms together with a genuinely low testosterone level, was uncommon. So fewer morning erections is a reason to ask a question, not a reason to assume low testosterone. We look at the other signs in what low testosterone feels like.
How do doctors use this information?
When a man sees a doctor about erectile difficulties, questions about morning and night-time erections are a routine part of the history. Together with questions about how and when the problem started, whether it happens every time or only in some situations, and general health, the answer helps separate likely physical causes from situational ones.
Guidelines on sexual dysfunction also describe formal testing of night-time erections in selected cases, using devices worn during sleep. These are not needed for most men, and a doctor will decide whether they would add anything.
When to see a doctor
A few mornings without an erection is nothing to worry about. It is worth booking a check-up if you notice a steady decline over several months, especially if it comes with any of the following:
- difficulty getting or keeping an erection during sex;
- a clear drop in sex drive;
- tiredness, low mood or reduced muscle strength without an obvious reason;
- risk factors such as diabetes, high blood pressure or smoking.
Basic checks of blood pressure, blood sugar, cholesterol and, where appropriate, hormones are simple and can be useful well beyond the bedroom. Our erectile dysfunction guide explains how the assessment works.
Questions men also ask
Is it normal not to wake up with an erection every day?
Yes. You only notice a sleep erection if you happen to wake during or just after one, so it is normal for some mornings to pass without one.
If I still get morning erections, can my erectile problems be psychological?
It can be a clue that the physical side is working, but it is not a diagnosis. Many men have a mix of physical and psychological factors, and a doctor will look at the whole picture.
Do morning erections mean I need to urinate?
A full bladder often coincides with waking, but it is not what causes the erection. Sleep erections are driven by the brain during REM sleep.
Sources & further reading
- Sleep Medicine Reviews Sleep-related erections: clinical perspectives and neural mechanisms (opens in a new tab) (2005) Hirshkowitz M, Schmidt MH.
- New England Journal of Medicine Identification of late-onset hypogonadism in middle-aged and elderly men (opens in a new tab) (2010) Wu FCW, et al.
- European Urology European Association of Urology Guidelines on Sexual and Reproductive Health—2021 Update: Male Sexual Dysfunction (opens in a new tab) (2021) Salonia A, et al.
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This article is general health information. It does not replace an individual medical consultation, examination or diagnosis. Read our editorial policy and medical review policy.
