Thomas used to go to bed really easily, after we'd looked at some books we'd put him in his sleeping bag in his cot bed, say goodnight to him, turn the light off and close the door. He'd be fine, no tears, not upset or anything. However for the past few weeks we put him in his cot bed he has been fine up until we leave the room and close the door. He is hysterical, crying, standing up in his cot, pulling the bars, screaming etc. It goes on for ages. If we go in to see him, as soon as we go in he stops crying but starts again when we go out again! Just wondering why this has suddenly started??? Any tips/ ideas? He is 26 months. We are hoping to move him to a toddler bed in a few months in a new bedroom but wanted to sort this issue out first cos i know swapping to a toddler bed will present issues of its own!