What Do You Need To Know About Morning Wood?
11 Nov 2025 · 13 min
Dr. Anne Truong explains morning wood, the involuntary erections during REM sleep triggered by the parasympathetic nervous system. It happens several times a night and signals healthy blood flow and cardiovascular function. Sleep quality, weight, exercise, and limiting alcohol matter for keeping it consistent.
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What causes morning wood is more complicated than you think. Stay tuned.
This podcast is for you. The modern man. I'm Dr. Anne Truong, your host. I'm an intimate health medical doctor and best selling author of the book Erectile Dysfunction Fix. I'll do a deep dive into sexual health and performance and how it affects men of all ages and backgrounds. So let's get started and be sure to visit my website@sexualhealthformenpodcast.com for more information and resources from the show. See you on the inside.
What is morning Wood? Let's dive into it. Morning wood is a slang term for nocturnal penile tumescent. Another word for it is morning glory. What this is is when you wake.
Up with an erection.
It could be occur in the middle of the night or could be early in the morning hours. And it's something that your body does when you're asleep. You have no control over it at all. So some people believe that sexual dream or full bladder can cause morning erection. However, what truly causes them are the parasympathetic nervous system. This is the same nervous system that controls system in your body such as digestion, urination and of course sexual arousal. When you have an erection. That is due to the activation of the parasympathetic nervous system, or the term for that is the rest and digest and breathe nervous system versus the other system called the sympathetic nervous system. It's fight or flight. That's the one that is prominent when you're stressed out and that's the one that inhibit you from getting an erection. All right, so to be get an erection you got your mind and your penis got to be relaxed. Interestingly, when you're asleep and when you're in rapid eye movement or REM sleep, rem, that's when you get erection. And it's perfectly normal and actually healthy to get an erection during REM sleep. Because during REM sleep is when you truly are in deep sleep. Rapid eye movement. That's when you dream. So not necessarily when you have morning wood. Is it related to sexual dream? It could just be that you're in deep sleep stage and when you're in deep sleep stage you relax and the parasympathetic nervous system is activated and therefore you're getting more blood flow, particularly to your penis. Interestingly, it's because of hormonal changes that happen when you're asleep. When you're asleep from 10pm to 6am is when your body heals physically and mentally. As your body is healing, the hormones are starting to be secreted. It's being released from your brain here and in the hypopituitary and then the pituitary gland and then goes to your testicles. So that's why sleep play a very important role in your erection. If you're not sleeping seven hours at nighttime, it's going to affect how your hormones being released and therefore it's going to affect your rapid eye movement. Therefore it's going to affect your morning erection. And most expert believe that the sacral nerve or the nerve that is near your bladder may stimulate this. But what happens is that when you're asleep, your bladder is full and then this stimulate the sacral nerve, which is the nerve that is different than the parasympathetic nerve. But when your bladder is full, it stimulates the sacral nerve and then that lead to activation of the parasympathetic nervous system. And that's how you get an erection. And you notice an erection more in the morning and because that's when you're kind of coming out of rapid eye movement. And as you're coming out of rapid eye movement or REM sleep, that's when you wake up and that's when you notice you have an erection.
Erection.
Think of morning wood as your body exercising your penis. Because you can have as many as three to six morning erection in one night. And each of them can last from three minutes to even 35 minutes. Yes. So that means that you can have up to, let's say each erection is like five minutes for simplicity, times six. That's 30 minutes. Up to like lasting up to 35 minutes times sick, that's like three hours. So it's your body way of exercising your penis is like doing shoulder press. Right. Bring in blood flow to your penis and trying to expand the penis, trying to bring more oxygen to the penis and perfectly normal. And that's why I find it interesting that you can actually have a morning wood for as long as 35 minutes. Now as you get older, you may get less morning wood. It's because as you get older, you're more prone to maybe not getting as much sleep. You're more prone to be more stressed. Yeah. High blood pressure, high cholesterol or diabetes or obesity, all of those factors play a role in your hormone secretion at nighttime. However, you can continue to get morning wood until the day you die. So a sign of having morning wood is a sign that, hey, the plumbing is still working in your penis, the nerve is still working in your penis and you just need to kind of tweak a little bit of lifestyle modification in order for you to get an erection on demand again. So oftentimes when I evaluate my patient, I ask them, they have morning wood, if they still have morning wood. And I know that the mechanism with the plumbing is still working. It just needs to be tweaked just a little bit. Now, sometimes men say, well, I don't really have morning wood. Sometimes it's hard to know, right? Because you got to have morning wood at nighttime when you're in deep sleep and not notice it when you're awake. And oftentimes there's a test that you put a tape that can be torn on your penis, you have morning wood, and that tape is ripped off. It's like one of those thin tape. That's what they used to do. Or you can have a camera that film you when you're asleep to see if you have morning wood or really nighttime wood. So it's perfectly normal to get nighttime or morning wood erection. And in fact, you should be getting it. And if you notice you're getting it less, then it's the time that, hey, you probably need to get maybe more sleep or maybe reevaluate your lifestyle, your diet, your exercise. And if you're smoking, you're drinking alcohol, or if you have high blood pressure. So having said that, it's perfectly normal for you to even have ejaculation during morning wood or wet dream. It's because that happens when you are sexually stimulated, when you dream. So that's something to keep in mind. And just know that your body is programmed to get morning wood, and it's programmed for you to get that for a whole lifetime. And for a man, it's actually a barometer of your sexual scale. I call it the sexual scale, right?
Because if you're noticing that you're not.
Getting as much morning wood, what the first thing you need to do is. You know what? I need to kind of evaluate first. Am I sleeping enough? Am I sleeping seven hours? What is my weight? Am I exercising 30 minutes a day or about three hours a week? Am I in the obese range or overweight range? And also, are you smoking? If you're smoking, you should stop. What's your alcohol intake? It should be less than about 10 drinks a week. Get your blood pressure checked, maybe get some blood work, see if you're not diabetic or you have high cholesterol. It's actually nice to have that barometer for a woman. We don't have that barometer. We don't know whether we have morning wood or nighttime erection or not. The clitoris for a woman is her penis. But unfortunately it's hard for a woman to know if she had a morning erection or not versus a man you can actually tell. So consider yourself being lucky actually that you do have an organ that you can gauge what your sexual scale sexual function is. And I encourage every man to evaluate your morning erection whether you have morning erection. If you don't have it, take a step back and evaluate what you can do to stimulate it. Not taking Viagra or Cialis is the answer. Sometimes just a little tweak of maybe sleeping more and concentrating on getting into REM sleep. How do you know you're in REM sleep when you're in REM sleep? It's when you have dreams. It's when you know you're in REM sleep. And if you're in REM sleep, oftentimes you will have morning wood as well. And doesn't necessarily mean you feel it in the morning. You could have it at nighttime as well too. Maybe you should consider using a camera at nighttime and see what is going on. So having said that, I wanted to kind of go into the benefits of having morning wood and to look for that and the frequency of having that and that you shouldn't be expecting for a man to get a morning wood up really until the day you die. And if you're not, let's start looking at your risk factors and changing your lifestyle so that way you can get it again and just know men that you can live more, love more and live happy life. And there are solutions to ED that is medication free and surgery free. I'll see you next episode.
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