I've been through that several times. I slept on the couch until I was about twelve.
Just recently, I had a problem where I was sleeping on the couch because sleeping in my room just freaked me out. I don't know why, but it did. I finally got over it.
I kind of get you feel. I've always had trouble sleeping in rooms where I'm alone. Especially now at my dorm room which is a little ridiculous because it's in a suite and there's a room right next to mine with girls in it...I don't know. I'm just really paranoid about that kind of thing. Plus I'm kind of scared of the dark so I have to have some kind of light on... like my laptop or cellphone...
Maybe listen to happier music or watch a happy movie in your room before going to sleep? That's why I do sometimes.