DS has been getting worse and worse at bedtime over the last 5 weeks. He used to go straight to sleep on his own but gradually it has got worse. Tonight we have been trying to get him to bed for 2 hours and he is still screaming now. He will settle down and look like he is asleep as soon we leave the room he is instantly standing up and totally screaming. He seems to know when we leave the room, we've tried the gradual leave so standing at his cot and then the door and then just out side the door but then about 5 mins later he is standing up screaming again - what else can we try. This is just getting so tiring every night, i'm beginning to dread bedtime. He has two naps in the day and they are totally fine, he will go into his cot settle himself down and go straight to sleep so why does he do that during the day and then behave totally differently at night?