Long day already..

I have decided to give up caffeine! My poor head is pounding, and I am exhausted... My older son is outside playing in the snow and the baby is playing next to me. Its amazing how different they are. N. is a wild man. He is constantly 100mph and a joker. I bet he would stay out in the snow all night if I let him. He also frustrates me to no end. K. is a sweet boy and very passive. When he sits and plays with his blocks I think about how N. never sat still when he was 1! Right now they don't get along. N. is very jealous of his little brother and he has started being aggressive towards him. I just don't know what to do to protect K. My house is a mess so i better get cleaning!