Ah, i understand this. I hate being alone at night, but it's really weird. When my mother and her boyfriend go out late at night or are on holiday, i don't feel comfortable. Even though my grandma is there, it feels weird. I often hear things and think that someone is in the house, i have to go around the entire house, turning the lights on and off. I carry a something in my hand as well, to feel more protected. I then have to sleep with my head under the covers. I have really bad paranoia and it gets worse at times like that.