Interesting. I was the guy you describe. I had a lot to do and could only get it done at night. My wife was a teacher and went to bed at 10. Too early for me. I also tend to be a light sleeper and to flop around at night, waking my wife (ex) up often. When she would awake, she would get angry (but she was not really awake). Still, made me want to sleep in another room so as not to bug her.