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Nocturnal Penile Tumescence

It’s an amusing, sometimes inconvenient, phenomenon that half of the world’s population has to deal with on a regular basis.
So what's the story behind the morning glory?

Turns out it starts IN THE WOMB!
Yep, babies get erections!

And it's not just men.

During sleep women have clitoral erections and vaginal engorgement!

Apparently it's all to do with our sleep cycle.
As we go through dream sleep, our brain slows down the release of chemicals called neurotransmitters. This stops us moving and prevents us from acting out our dreams.

One of those neurotransmitters is called norepinephrine and it plays a role in restricting blood flow.
So with less norepinephrine our circulation increases and BINGO!

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