Why don't I like to sleep? ?

Well I have been keeping myself up until late times like 1 or 2 am sometimes later, but I don't know why. I'm aware I'm doing it and even tell myself I need to go to sleep but I just don't. I'm always scared before I go to sleep, not sure of what, but just scared. I'm not comfortable alone, but I don't think I have anxiety. I'm not hyperactive, I dont have insomnia, it's like a conscious decision that I can't stop. I have been under a lot stress and I think I may be clinically depressed but idk if that has anything to do with it. Any ideas? Please and thanks.