Congrats that man! just a tip, it may be tough but cherish every moment and it does get better ..
I now have my little 2IC on my lap asking "are those mens dead daddy ? " .. to which I enivitably reply (seeing they are my troops) .. "no, they're just having a rest .. " ! mutter
Anyway, for my third, I spent 7 months sleeping rough on the lounge-room floor just so I didn't fall asleep on my keyboard at work - something experienced with the previous 2.
All worth it when you hear your first "dadda" .....