My 9-year old daughter has a history of being scared at night. We’ve tried leaving the door to her room open, night lights, sound machines playing soothing ocean waves. The best thing we’ve found to work is the scent of lavender.
I love this little lavender spray from Healing Gardens. I just give her pillow a spritz and she sinks off to dreamland.
A lavender sachet underneath her pillow would work, too.
Be sure to only use real lavender or lavender essential oil, and steer away from commercial perfumes that are made from chemicals instead of plants.