Reply to Mixing in headphones

Second post in the same day! BOOM! Due to neighbors and late evening cravings, I've found myself mixing through my headphones. I really dig it. Can't seem to find a good position for my rokits, so the music kinda sounds off to me in my apartment. Basically what I'm trying to get at is this: is mixing within headphones a bad habit? The sound just seems to good to be true.