I dont think its unreasonable. Id nearly go so far as to say its a bit direspectful to come up, get laid, and go back downstairs. Its the wanting sex is the issue not the staying up late....
In saying that im a night owl too and frequently dont settle to bed until 1/2am. My OH is only here at weekends so during the week it doesnt effect him me being up late.
He works at 6am mon-fri & is usually in bed by 10pm. I know i'l find it really hard to go to bed at a reasonable hr when he's able to stay here full time. I'l have to do it for his benefit, and it wont be to get sex lol, just so that he gets a good nights sleep without me disturbing him half the night. I think its an issue of respect, however id be pissed at him if he gave me a 'bedtime' as such.
What does he do until 2/3am? Does he have to get up for work? I know somedays I can be a right moody cow but its all my own fault for staying up so late. I suppose it depends if him being up so late is affecting your relationship & time with the kids. xxx