I'm sorry for your struggle, that must make sleeping quite difficult. I am wondering if these voices are OCD related, or perhaps another disorder/illness? I would definitely bring that up to your doctor if it's not just OCD static.

I have OCPD, so I don't have intrusive thoughts. However I did have OCD for most of my childhood. I stopped listening and responding to the compulsive thoughts, eventually they went away. I am assuming you are an anxious person, maybe try incorporating something like yoga or meditation in your lifestyle? I usually listen to music when I am falling asleep, focusing on the song/lyrics seems to keep my mind from wandering. Also, I realize this is symptom of my OCPD, so I'm not sure if I should recommend this, but I really love making lists. Try to think about everything that's in your head, and write it all down. When it's on paper, it doesn't need to linger in your head. I usually write it down, and then give myself permission to 'check out' for the night. Sometimes I assign a day/time to each issue, so that I don't need to worry about dealing with it until the designated time.

Also, if you find that you cling to phrases, or repeat words and numbers, you might want to find some nice quotes or positive affirmations that speak to you. You can write them down on nice paper and decorate them, and post them around your bed, or in your bathroom, car, or wherever! That way you can try to replace the negative compulsive thoughts with positive ones.

Best of luck!