Rescue cat, had her a few months, no problems until about a month or so ago.
As you can see it's the crack of bloody dawn and I've been up twice already for the cat. I wake up for work at 6 for a twelve hour day- my sleep is precious 
The cat seems to hate being alone at night, she's ok for a bit, but then will seek me out and cry and cry like a baby until I give her belly rubs and lots of fuss. If I let her in the bedroom she will wake me up. I tried shutting her downstairs but she will actually headbut the door until I think she might hurt herself and I go down for her.
I think she might be under stimulated generally- she has never shown any interest in going outside, i don't think she was ever an outdoor cat wherever she was before. I've tried new toys, change of diet... she woke me up at 4 and I'm currently on the sofa with her so she doesn't wake up the rest of the house. She's fast asleep having got her preferred human to come and sit with her 
I'm going to be so exhausted at work today and I've never had this problem with any cat I've owned before.
Any ideas please?