When my marriage ended, I was so fearful of the nights and being alone. What helped me was the thought that my little home (especially my bedroom) was my sanctuary. I visualized that it was my safe place and no one could ruin my sanctuary in any way. My bed was my safe cocoon and I was serene and safe there. I still feel that way about my room - especially since I painted it green. Keep a little night light on. I bought a cheap little lava lamp that has silver sparkles in it and I turn it on and it makes pretty shapes in the dark. Sounds silly but it works for me.

Keep your phone by your bed just for a little bit of assurance and keep telling yourself that you are safe. Sleep well.