Sleeper's hand in warm water

I decided to include this here as a possibly useful tool for a caregiver of an adult baby, though its use might be questionable. The intended subject is sleeping, and the caregiver places the sleeper's hand in a bowl of warm water. This is expected to stimulate the involuntary urge to urinate. It should cause 'baby' to pee in his/her diaper. It has never happened to me, although I have heard of it being tried on unsuspecting juniors in residence. Has anyone else had any experience with this effect? It was the use of q rectal thermo stimulation of involuntary pooing written up elsewhere that stimulated my ancient memory of this phenomenon...

Cos

I was sleeping in a bunk on a naval ship during hurricane katrina. One of our ship mates would sleep with his arm hanging over the side of his bunk. The thought of holding a cup or jar of warm water occurred to me. I would have had to climb out of my bunk, gone to the head and draw some warm water, I didn't have a jar or cup, so was unable to try the experiment.

This guy scored like a chain saw, he would have deserved it.

Most likely an urban legend. A controlled experiment (albeit small sample size) came up with zero wet beds!

https://www.mentalfloss.com/article/51268/does-hand-warm-water-trick-really-work

I never needed any help to pee in my bed, I wore diapers and rubber pants until I was nearly 18 and wet my diapers most nights. Regardless of how wet or dry they were when I woke up, I usually had a woody, played with it until it wet until cum squirted out and a few minuets later had another big potty. After that, I wore diapers when I was able and never had a problem wetting them, night or day.