My 23 month old has slept through the night since around 10 months old, but the last 6 weeks he is waking up every night shouting mama/dada. he doesn’t cry but just shouts till we go in to him. He usually settles back down but can take up to an hour to go back to sleep!! He then will sleep till 6am but now him waking 5am is happening more and more and won’t go back to sleep and wants to come into our bed. Is this just a regression or some kind of separation anxiety? We have tried to leave him to settle himself but just gets worked up and cries and screams for us. Please help 😩