Why do you get 'morning wood'?

Morning wood has surprisingly little to do with arousal.


Nocturnal penile tumescence, more commonly known as ‘morning wood’, is when a man wakes up with an erection in the morning. It’s a common physical reaction. So common in fact that it can happen three to five times in a single night with each erection lasting up to 30 minutes. But why do men get morning wood?

Many ‘morning erections’ actually occur during the night or during the rapid eye movement (REM) phase of sleep. They could be related to dreaming, but there is no clear evidence to suggest as much. 

Morning wood has little to do with arousal. In fact, one survey found that most men felt the erection was more of an annoying wake-up call than a pleasurable experience. In some cases, a morning erection may even cause pain and disrupt sleep; a condition known as sleep-related painful erections.

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Although ‘morning wood’ is poorly understood, research suggests that it could be related to the absence of functioning neurotransmitters. During REM sleep, neurons releasing noradrenaline may be turned off. Noradrenaline actively suppresses erections by restricting blood vessels. Consequently, testosterone levels rise and cause more blood to flow to the penis. An erection follows. Another theory is that nitric oxide is released during REM sleep, which causes the smooth muscles of the penis to relax, and blood to rush in.


What’s the purpose of morning erections?

Even though they can be annoying (especially when bunking with a stranger), morning erections are a good thing. They’re an indicator of healthy sexual functioning. By monitoring the frequency of your morning wood, you can detect early signs of erectile dysfunction. Healthy men should expect experience an erection around three to five times per night. This indicates healthy blood flow to the penis. In men over the age of 50, the frequency of morning erections may be lower.


If you notice that your morning erections decrease or stop, it could be a sign of erectile dysfunction and related conditions.  These may include high blood pressure, diabetes, cardiovascular disease, hormonal deficiencies or any condition that impairs healthy blood flow.


What should I do if I don’t have regular morning erections?

If you notice a decline in the frequency of your morning erections, it may be time to visit a doctor. Medical issues such as diabetes, obesity, high blood pressure and high cholesterol are associated with erectile disorders. It’s a good idea to assess other reasons too. One study, for example, found that in patients with a lack of sleep, nocturnal penile tumescence decreased. Similarly, research suggests that the prevalence of getting hard in the morning is decreased in men with depression.


Erectile dysfunction is treatable, but it’s important to discuss any changes to your morning erections with a doctor.  



  1. Male Erection Frequency | (2019). Retrieved September 17, 2019, from <>
  2. Vreugdenhil, S., Weidenaar, A., de Jong, I., & van Driel, M. (2017). Sleep-Related Painful Erections—A Case Series of 24 Patients Regarding Diagnostics and Treatment Options. Sexual Medicine, 5/4: e237-e243.
  3. Joannides, P. (2019). Are All Erections the Same? Men Discuss the Differences. Psychology Today. Retrieved September 17, 2019, from <>
  4. Bancroft, J. (2005). The endocrinology of sexual arousal. Journal of Endocrinology, 186/3: 411-427.
  5. Elhanbly, S., Abdel-gawad, M., Elkholy, A., & State, A. (2018). Nocturnal penile erections: A retrospective study of the role of RigiScan in predicting the response to sildenafil in erectile dysfunction patients. Journal of Advanced Research, 14: 93-96.
  6. Andreev-Andrievskiy, A., Lagereva, E., & Popova, A. (2018). Reflex erection in the rat: reciprocal interplay between hemodynamic and somatic events. BMC Urology, 18/1.
  7. Qin, F., Gao, L., Qian, S., Fu, F., Yang, Y., & Yuan, J. (2018). Advantages and limitations of sleep-related erection and rigidity monitoring: a review. International Journal of Impotence Research, 30/4: 192-201.
  8. Zhang, Y., Chen, S., Ma, G., Lai, Y., Yang, X., Feng, J., & Zang, Z. et al. (2018). 632 Consecutive nightly recordings are required for the accurate monitoring of nocturnal erections. The Journal of Sexual Medicine, 15/7: S367.
  9. Thase, M., Reynolds, C., Jennings, J., Frank, E., Howell, J., Houck, P., & Berman, S. et al. (1988). Nocturnal penile tumescence is diminished in depressed men. Biological Psychiatry, 24/1: 33-46.

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