Morning erections are a normal sign that the blood vessels, nerves and hormones behind erections are working. Healthy men have several erections during sleep, and the morning erection is the last one at waking. A persistent absence or clear weakening may point to a physical cause of erectile dysfunction, such as a blood vessel problem or low testosterone.
Medically reviewed by Prof. Dr. Samir Ahmed Al-Samarrai, consultant urologist. Last reviewed:
Why do morning erections happen?
Erections during sleep are linked to REM (dreaming) sleep and happen several times a night without sexual arousal. Waking during or just after this stage reveals the erection, so it does not appear every day and becomes less frequent with age.
What does it mean if they happen but sex is a problem?
If morning erections are firm but erections weaken only with a partner, anxiety or psychological and situational factors are more likely. This does not rule out all physical causes, so a medical assessment still matters.
What can absent or weak morning erections mean?
- A blood vessel problem from diabetes, high blood pressure, cholesterol or smoking, which can be an early sign of heart disease.
- Low testosterone: in a large European study of middle-aged and older men (2010), fewer morning erections was one of three sexual symptoms linked to low testosterone, together with low desire and erectile dysfunction. Read about low testosterone.
- Sleep problems and lack of sleep.
- Some medicines and alcohol.
- Depression.
Can erections during sleep be measured?
Yes. In specific cases the doctor requests nocturnal erection testing to record erections during sleep, which helps separate physical from psychological causes. Most men do not need it. Read about erectile dysfunction tests.
When should you see a doctor?
- No morning erections, or clearly weaker ones, for several weeks.
- Erectile problems during sex for more than a few weeks.
- Low desire with persistent tiredness.
- Diabetes, high blood pressure or heart disease together with erectile problems.
Related topics
Frequently asked questions
Is it normal not to have a morning erection every day?
Yes. Morning erections depend on the sleep stage you wake from and become less frequent with age. What deserves attention is a persistent absence or a clear weakening over a long period.
Are morning erections caused by a full bladder?
Erections during sleep are linked mainly to REM (dreaming) sleep and happen several times a night; the morning erection is the last one at waking. A full bladder alone does not explain it.
If I have morning erections, is my erectile dysfunction psychological?
Having them usually means the erection mechanism works and points towards psychological or situational factors, but it does not rule out every physical cause, so the doctor assesses the whole picture.
Sources
Book a consultation
Prof. Al-Samarrai and Dr. Amer Mousa assess erectile dysfunction at Prof. Al-Samarrai Medical Center, Dubai Healthcare City. Medical consultations are confidential.
This information is for health education and does not replace a medical examination. See our medical content policy.