Hello Rara200284. I had a father who did something similar. However, I've not been diagnosed with PTSD, so this may be different than. I feel always uncomfortable sleeping in strange places. I never sleep any place except my bed if I can. Otherwise, if I need to sleep somewhere else, I stay awake for hours before I can get myself to sleep. Even than, I wake up early. I too suffer from many nightmares. In a way, I'm kind of glad I stay awake, because I still worry about my strange surroundings. However, for you, I can see how your PTSD might cause this.