Two ds share a room. Ds1 nearly 4 ds2 nearly 1. Ds2 wakes up every single morning between 4.30 and 5 and will only go back to sleep with a bottle. Ds1 rarely wakes up but if he does, that's a whole other kind of hell that we won't go in to. Don't have an issue with controlled crying but it just isn't possible when they share a room. He's the odd thing, every single other place we go, my parents, inlaws, friends, hotels (you name it), ds2 sleeps through the night.
So what is the problem with their room??!! It is not light, it is not noisy, it's warm.
Any ideas before I permanently lose the plot would be much much much appreciated!!!!