Why is it that (for me, at least) creative inspiration always seems to strike late at night?

I get home from work, decompress, and you would think that would be the perfect time. Nope. 11pm rolls around? I am now possessed with that creative spark and I've got 3 new ideas to implement into my game, working on it until 1am... and then I have to go back to my day job in the morning. Time for more caffeine.

Anyone else? Just me?