Am I going crazy?

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I wasn't sure where to post this. I'm not even sure if this is dream related, sleep related, or if I am just a mental case. I'll explain:

Sometimes when I lay down to fall asleep, I close my eyes and I start seeing disturbing visions. I am usually tired, but not quite asleep yet. The visions are usually so disturbing that I open my eyes so that it goes away. I never hear any sounds or feel anything. The images are ALWAYS frightening, disturbing, and etc.

The visions/images/whatever have consisted of things such as demon-like creatures, killing/murders, an evil old lady with rotting teeth snarling at me, someone throwing a baby over a cliff, some things that I could not even put into words so I do not know how my brain could produce them, and various other scenes that I have since repressed.

When they happen they are so clear. They almost feel paranormal. I will point out that I am not a religous person, I am agnostic.

Help! Do I need crazy pills?