Medically induced coma , people don't seem to be aware of time passing, like a general anaesthetic. They do however have some recall of the waking up process. Coma for medical reasons the patients I nursed in itu who recovered remembered strange things.
The best story wasn't one of my patients but a couple of colleagues...
Nursing a young man who was in a coma after an accident, the girls very unprofessional but not unsurprisingly commented on the general proportions of his equipment.
He recovered and eventually came back to say goodbye. Recognising a voice he called across to one of them.
Oh nurse, thank you for the compliments about my manhood