Future studies are also needed to include a larger, more diverse sample as most of our children were from 2 parent, highly educated families whose family income was in the medium range. Because selection of a 4-week treatment period was arbitrary and shorter than many traditional cognitive–behavioral treatments for nighttime fears, future studies might also determine the effects of longer time frames with books such as this (e.g., 6–8 weeks). Additionally, a longer follow-up period would help to determine maintenance of effects and whether children continue
to improve over time.