How can I stop being so scared of the dark?

I am seriously terrified of the dark. I lie in bed awake practically all night imagining monsters out to get me (things with creepy eyes and clawed hands reaching out to grab me *shudders*) I've tried to tell my parents about it because it makes me mad that I have this weakness, but they thought I was kidding and laughed me off. I purposely leave the lamp next to my bed on to illuminate my bedroom, but my parents see it if they get up to use the bathroom, etc. and they get mad at me for wasting energy. I've tried the whole, "face your fears" thing, but if anything I think it just made my fear worse. What can I do? I've been through a lot in my life and have become stronger because of it, but this makes me feel weak and I can't stand it. Please help me!