All my dreams are nightmares

I have always dreamed. Lately though, I have been finding that I have not been remembering my dreams. The only time I remember my dreams is if I am awoken in the middle of them. When I do wake up and remember my dreams, because of odd noises or lights at night, they are always nightmares. Gruesome awful nightmares that keep me awake for quite some time as I wonder about them.