Why would a grown man have a problem with the bedroom door being closed at night?

I had forgotten about this. Over Christmas I went looking for nightlights for the twins. At the Dollar Store the clerk and I started talking and she said her husband can not STAND to have the bedroom door shut at night. He actually becomes angry if she forgets and starts to closes it. He can’t seem to give her any reason for it, just that he hates it.
She was in her 40’s, I’d say, so it’s safe to assume they both are.

That would drive me nuts. I want a dark, quiet room. I don’t want to be able to hear the TV or see other lights (like the stove light) in the house.

When the kids were home, though, it was a different story. I wanted the door at least cracked, so I could keep an ear on them, but since they’ve moved out, CLOSE IT!!