My 20 month old son is wild

I have a 20 month old son that wines all the time. He dont listen when he does something wrong i let him know and about two minutes later he does again. No matter how hard i get on to him it dont phase him. I raised my nephew and he never acted like this. I really dont think it is normal. He dont want to sleep at all. He gets up about 7 a.m  takes a nap around 12 wakes up at 2 and i lay him in his crip at 8. He will lay there and not go to sleep till about 11;30 to 12 oclock at night he screams all the time loud and wines 24/7. What can i do? Is this normal?

[ktf]

Do you keep him entertained and busy, not all children need to sleep so much, its too early to say he has a problem as that is a tricky age, how do you let him know he`s doing something wrong? have you spoken to a health visitor?