I recently learned through my own experience that this is a very useful tool recommended by many professionals, especially in assisting with sleep disorders and nightmares suffered by survivors.
I have my grandmother's old bedspread, just an old worn-out, stitched and patched ugly thing, but it helps me sleep at night. She lived next door to us when I was little. She was my father's/perp's mother, the only adult who intervened and attempted to put a stop to the abuse.
When she died 25 years ago I kept her bedspread out of sentiment, but now it's a very important symbol of safety and peace when I sleep at night. It's the only way I can convince my sub-conscious that my perp/father won't awaken me with sexual assault during the night.