But I’m sure a daily 8hr sleep in water isn’t something our bodies are ready for. What are probable effects? Can we mitigate them?
It’s actually a reflexive response by your body caused by the constriction of blood vessels in the skin, improving grip on wet surfaces. If you have nerve damage to the hands, feet, or related areas of the spine, the wrinkle reflex won’t function.
Related article: https://www.scientificamerican.com/article/why-do-our-fingers-and-toes-wrinkle-during-a-bath/
Only your kidneys handle the expulsion of excess water, so what you read isn’t accurate.