Sleep is very subjectively different from anesthesia, in my personal experience. Sleep still carries a feeling of the passage of time, and in fact dreams can fe

Sleep is very subjectively different from anesthesia, in my personal experience. Sleep still carries a feeling of the passage of time, and in fact dreams can feel "more real than real" (I remember my dreams to varying degrees, most often when I drink alcohol, although I don't like to use that as a specific method to remember dreams on demand). Anesthesia, for me, resulted in the absolute cessation of time experience during the process. From my perspective, I went out in the OR and was immediately in the recovery room, even though it had in reality been about an hour.