Does placing the hand of a sleeping person in warm water cause urination? How?

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Hank asked the Naked Scientists:

What physiological mechanism is at work in the old college trick of sticking a
sleeping person's hand in warm water to precipitate involuntary urination?

What do you think?


Offline Karsten

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Don't know if it works. I would wake up if anyone even took a breath in my presence when I am sleeping.

I assume it is based on the myth/phenomenon that one relaxes when exposed to warm water.


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Offline Chemistry4me

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