This is really just to give reassurance and comfort to little ones when they can't sleep, whether it's because they believe there are monsters, snakes or aliens in their room or under the bed.
Never has the placebo affect been more effective!
Do bear in mind little ones have quite different preferences to us! They tend to dislike florals and love fruity scents or sweet lolly type fragrances.
Good choices would be Jelly Beans, Red Skin Lollies, Fruit Loops etc.