Recent in-bed times at our house:
Last Night: 9.15pm
Sunday Night: 8.20pm
It just seems that if the sprog is asleep, and we're not at work (which is far more often than not the case), we find ourselves wondering why the hell we aren't asleep ourselves. We put on a video, or open a bottle of wine, and one glass and 10 minutes past the credits and it's: "Feck this, we could be sleeping or screwing, or better yet screwing and then sleeping. To bed!".
It's a natural reversal of the sorely missed lie-in, which may be the only thing I truly miss about pre-parent life.