Since when does an 18 month old not need any sleep? We cut out a the second nap, put him to bed later and still for months he gets up at 2-3am and stays up until 5-6am. Once in a while he will throw us a bone and sleep all night...maybe 1 night a week if we are super lucky. He doesn't cry at night. Just screams in delight, claps his hands, jibber jabbers, yells mommy and daddy. You name it...at 3am he is doing it. We try to take turns getting up but really he will not let anyone sleep. Mystery. Today he had zero nap time. No nap. You would have thought that he would just fall over somewhere asleep..nope. He will not go to sleep unless I have adequately rocked, hummed, shook, juiced...ahhh. Sweet sleep...I miss it.