What Sleep?!?

I new that eventually babies would cry in the middle of the night, but what is with my son not going to sleep till 1-2 in the morning? And then after that he is still up bright and early with full energy ready to play. Oh and don't even think that you can ignore them, I've gotten a couple of sippy cups thrown at my head that way. What it all comes down to, we trade our sleep and our sanity for his peace and quiet.