HI Eve,
Are these dreams? Sorry when people say nightmares sometimes I do not understand if that means anxiety or dreams.
In my 20s, after I moved out of my mom's home, I used to have re-occurring dreams about going back living with my mother and her taunting me like ooh you are back who is gonna protect you now with devilish laugh. they were frightening dreams.
They were going on for while and also weirdly my siblings had similar dreams after they moved out too. to me it was like processing the trauma because i was finally safe!
I feel similar reaction to your nightmares. Maybe you are in a safe space now and they need to be processed so they are coming up for work. Do you journal them? I would recommend you write down your feelings as soon as you wake up every time and see over time, how you are feeling or changes. I do not recommend ignoring them or trying to suppress them. nightmares hardly ever go away on their own until they are dealt with. Also I read dream books including Freud's famous one (which I highly recommend), and dreams are reflection of the dreamer's subconscious. the people in the dreams are props demonstrating primitive or trauma feelings or experiences. It is possible you may have unfinished business about how your mother dealt with your trauma then.
after I got over my mother's threats in my dream, I started the "bus dreams" that went on for over 20yrs until I went to therapy. I could not process them because they were unpleasant/annoying/inexplainable and frustrating and extremely repetitive. But in therapy, they went away. So I think my mind, body and psychic were asking me to start uncovering my trauma and I was in denial most of my adult life.