I've made a "nightmare spray" for my son. I mixed up a few drops of lavendar essential oil in a spray bottle with water. The lavendar helps calm and relax him and he can smell it and feel it when I spray it on his skin (diluted lavendar oil is completely safe for children and babies). When I put him to bed we spray it around his room together and I talk to him about how this frightens the nightmares away. I put it close to his bed so that he can get it himself or my partner or I can get it if he wakes up and we spray it anytime he feels frightened or worried. It seems to help and Louis loves spraying it around.