Why do some guys have erection when they wake up in the morning and some don’t?

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Why do some guys have erection when they wake up in the morning and some don’t?

In: Biology

The “morning wood” is related to blood pressure. As you wake up the blood pressure changes rapidly. So if you get morning wood or not depends on how much and how fast and how much your blood pressure changes, how fast your body is able to regulate the local blood flow and how easy it is for you to get an errection. And this can change from day to day and is different for everyone.

Erection occur during REM sleep, so you have several throughout the night while you sleep. Weather you wake up with a boner or not just depends on when in your sleep cycle you wake up.