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How do I cope with an incredibly selfish sister who is keeping me up at night and then playing the victim when I complain about it?

I'm 30 years old and I live with my sister in a shared flat. She works in healthcare so she works nights but she has become nocturnal to the point where every night she disturbes me multiple times througout the night and I am beginning to feel depressed and run down over lack of sleep.

There is a complete lack of regard for how this impacts me. This has been now going on for 4 months and there is no remorse or apology and she keeps doing the same thing and making excuses. She has borderline personality disorder and other mental health problems, but I constantly feel like I'm walking on eggshells around her, trying to please her and I feel like I have been silenced into compliance and I am not allowed to talk to my mum about how her behaviour is impacting on me. It starts with her buzzing the bell at midnight, and coming in with about five different takeaways to eat throughout the night. She will then drink a bottle of wine to herself every night and keep me up with noises such as the shower going on at 2am and the tv and microwave until the early hours of the monring.

I have tried talking to my mum about how much this is impacting on me mentally, but my mum just says 'that sounds difficult' and nothing is ever done about it. Then when my sister finds out I've complained about her nocturnal habits to my mum, she accuses me of slagging her off behind her back and bitching about her, and plays the victim and makes me out to be the monster, for just trying to assert myself. She will say things like 'I feel like you hate me' and 'you are turning the family against me'.

I feel like I can't get anywhere with her, there's no communicating to her how it impacts me. I've tried to tell her how much it affects me that I get woken up and sleep deprived every day. I have to work in the daytime and it is having a severe impact on my ability to work and concentrate that I am getting complaints now about my work.

How can I cope with this moving forwards?

How do I cope with an incredibly selfish sister who is keeping me up at night and then playing the victim when I complain about it?
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