Our 20mth old son has recently taken to waking up in the night and when he realises that we aren't coming to his room, stands up and bangs his head off the top of the cot repeatedly. He has started to do this so much now that he has bruises on his forehead. We have (probably foolishly) started to take him into our own bed as we've been so worried and he immediately goes to sleep!! Has anyone experienced this? How can we stop him headbanging? It only ever happens at night when he is already awake and screaming for mummy or daddy. He never headbutts anything during the day.