“I seem to recall studies of folks in those “habitat” facilities where they couldn’t tell what time it was or see the sun. Some interesting stuff came out of it.”
My wife was just in the ICU for two weeks. And there is a thing called ICU Psychosis which does that. The last three days she was indeed losing her mind. Still after being out five days later she is having issues at night while trying to sleep. Crazy livid dreams, people talking to her who are not there when she is awake, Etc.
https://www.medicinenet.com/icu_psychosis/article.htm
Because they keep waking you up to check your dang BP.