I have been under a couple of times, full anesthesia. I do not recall dreaming at all.
I am not really qualified to comment beyond that, but in my cases it was “here one second, black for a second, and then back.”
No visions, no dreams. Just woke up and I had stitches in my mouth and life was good again. Well, after a couple of weeks life was good...
I’ve been under general anesthesia five times and my experience has always been as you described. No dreams, no visions, no sense of elapsed time. That being said, I accept that others may have experienced something different during their times under general anesthesia and/or circulatory arrest. One of the interesting things about articles of faith and belief in life after death is that they can’t be proven or disproven through scientific means.
Same here on a couple of occasions. I believe that in these NDEs, it's just the brain shutting down. How many time when someone THOUGHT they were going to die, they saw their life flash in front of them? (Maybe they were just "uploading" to a bigger CPU.)
I find it interesting that Christians always see Jesus (even children say they saw "baby Jesus"), but Muslims or Buddhists never do - dunno who/what they see, but I think it's just a natural mechanism that gets a religious twist put on it.