I have two EB siblings, a male Bulldozer and a female named Blossom, and since day one they have always slept beside each other in separate crates, but beside each other. It's so funny to see them sleeping because they always sleep in exactly the same position, facing the exact same direction, and whenever one moves, the other one moves too. At first I thought it was just a coincidence that they slept like this, but they do it all the time. It's so cute. Must be a sibling thing.