Curated OER
Kids Health: What Sleep Is and Why All Kids Need It
This comprehensive site defines sleep, its stages, and it importance. It also gives tips on how to get all the sleep you need. It also includes a game comparing the average amount of sleep that kids, adults, and different animals get...
University of Washington
University of Washington: What Is Sleep?
A nice overview of the sleep process. There is information on the stages of sleep and the reasons why we sleep. The site also has a few surveys you can take to compare your sleep experience to others.