This topic overview from the database Gale Health and Wellness provides a background article on sleep and links to many sleep-related topics. It can be a good place to get started if you aren't sure what topic you'd like to explore. There are also topic overviews on Sleep Disorders and Dreams.
Sleep Information for Teens
This book has lots of great chapters that may be useful. Some are listed below, but click here to see the full table of contents.
A Case a Week: Sleep Disorders From the Cleveland Clinic
A Clinical Guide to Sleep Disorders in Children and Adolescents