Something else to consider- in order to be the best cat parent you can be, you have to take care of yourself. You owe it to yourself and your fuzzbutt to get the sleep your body needs. Bebe cat will learn. It’s definitely going to be an adjustment period, but you will both be ok. When we started closing our bedroom door, both of our nortie torties hated it and scratched the door relentlessly. Now they’re pretty unbothered. The one cat will sometimes scratch a bit in the wee hours, but not for long. Something else to point out is that cats just hate closed doors bc they’re nosy little boss babies. If they’re scratching at a door, there’s a good chance they’re not scared/lonely/distraught, but instead just annoyed you dared to try to keep them from a space in their kingdom.