If you want to avoid nightmares, you can live in a house facing south, with the bed in the north-south direction and the bedside in the north.
If you still want to be on the safe side, buy a black crystal or obsidian pendant (other types are ok, but not a dog type, because it conflicts with your zodiac). On the one hand, black crystal is as famous as obsidian in eliminating negative energy. Wearing black crystal can eliminate evil, avoid evil, turn evil into evil, and prevent negative energy from invading. If so, the bracelet needs to be worn on the right hand. Second, black is good for you. Third, black belongs to water, and it is also the representative color of the north, which is good for you.