Wrecked sleep, no sleep is so like Chinese torture. My son, now 5 still has difficulty sleeping. My daughter, 10 months wakes at least twice a night and wants a bottle and then falls back to sleep. It's worse when she's teething.
My DH doesn't like sleeping so i think both kids take after him whereas i could sleep standing up anywhere, anytime!
They both wake at 6am as if they need to go to work!
I guess each child is different.