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 each day.

Psychology is designed to meet scope and sequence requirements for the single-semester introduction to psychology course. The book offers a comprehensive treatment of core concepts, grounded in both classic studies and current and emerging research. The text also includes coverage of the DSM-5 in examinations of psychological disorders. Psychology incorporates discussions that reflect the diversity within the discipline, as well as the diversity of cultures and communities across the globe.Senior Contributing AuthorsRose M. Spielman, Formerly of Quinnipiac UniversityContributing AuthorsKathryn Dumper, Bainbridge State CollegeWilliam Jenkins, Mercer UniversityArlene Lacombe, Saint Joseph's UniversityMarilyn Lovett, Livingstone CollegeMarion Perlmutter, University of Michigan

By the end of this section, you will be able to:

Differentiate between REM and non-REM sleep
Describe the differences between the four stages of non-REM sleep
Understand the role that REM and non-REM sleep play in learning and memory