..because I resorted to standing at his door at 4am and losing my temper :(
He's doing it because he can - because he gets attention. He doesn't seem to mind if the attention is positive or negative and (tellingly) doesn't give two hoots that he's waking his 3mo baby brother too.
He has a stairgate over his door but still shouts from his bedroom until we come to him. If we ignore him, he screams and wails at a horrendous volume.
He doesn't seem to respond to sticker charts or rewards and I genuinely don't think that anything is actually wrong when he wakes up.
helphelphelphelphelp