I switched my son to a big boy bed months ago. He hasn't had a problem staying in bed till last week. He will scream and come charging out of his room around midnight. I put him back to sleep and he wakes between 4 and 7am. But he doesn't scream then and he walks into his sisters room who is 4 months old and wakes her then proceeds to my room. And asks to go downstairs. He isn't sleeping well or long and now my daughter is getting woke up. Any ideas? I've tried nightlight, shut door, he has a tablet to play with in the morning while I feed his sister, toys in his room only keep him busy for a couple minutes, and I'm running out of ideas. I put him back to bed but by then he has woke the house.