My dog died several years ago, and he had dementia before he died. He didn't bark (in fact, he forgot how) but instead he paced. All night long. The pacing, his nails clicking on the wood floor, made me batshit.

It eventually subsided and we had another decent year with him. So, it might go away. Some things that helped him were a weighted blanket when we went to bed (he slept with me), a crate for when he was very confused, and an occasional melatonin (vet approved) to help with sleeping.

It's hard, though. Be gentle with yourself and kitty.