What go on surrounded by the body when one sleeps?

Why is sleep necessary?What go on surrounded by the body when one sleeps?
To rejuvinate and to restore to health. Also a mental break. Dreams work out issues on the mind (subconsciously) Without sleep we'd all stir nuts.
Blessed Be
-Obsidian
sleep is necesarry as a means of rest for our mind as powerfully as t body. though our parasympathetic works, like our Gastrointestinal system, pancreas, and other visceral organs.
Don't know - I only just go onto autopilot, and if conscious at adjectives I'm usually somewhere else. I reckon sleep is necessary to tolerate the mind digest the wakeful day and permit the muscles have a break. I used to do much of my best work while asleep, wake to find writing drafted in my mind, problems or opportunity planned ready for the detail. And dreams I could imitate upon, learning much. What fun!