Empathy and Advice Welcomed Sleep issues due to past abuse

I was sexually abused as a kid and have PTSD. Now I live in a group home. One of the residents often screams at night and sometimes my housemates get are up with other issues. We do usually have two staff overnight for the four of us which isn’t bad but on Tuesday nights and only Tuesday nights there are different staff who I don’t trust if something were to happen. I just don’t feel safe. So I’m usually up worried and hyper-vigilant until I crash out of exhaustion at about 1 AM. This is only once a week as I said but the real problem is it’s messing up my sleep schedule for the rest of the week.

I'm sorry you were abused and have PTSD, and that you're having this problem with sleep now.
Do you want to say what it is that makes you feel not safe? It's ok if you don't want to say, but it might make it easier to understand the situation.