The thyroid can cause these symptoms. Its very common and annoying. Its an easy blood test to check it. The post above about patterns and seeing faces in clouds etc is really the key. I am a pattern thinker and my mind constantly wants to find order in chaos to make something of nothing. And i used to like to scare myself at nothing. Doing any type of puzzle or brainwork before bed can help. Doing more puzzles or intellectual things or crafts during the day help you sleep better at night. Also calming things help. Your fear center is being overstimulated instead of your higher intellect. Using your higher intellect and avoid fear center triggers helps me alot. Tv can be really bad. Ads work by triggering fear.