This document provides an overview of sleep and sleep disorders. It defines sleep and describes the four stages of the sleep cycle: NREM Stages 1-3 and REM Stage. Common sleep disorders like sleep apnea, insomnia, narcolepsy, sleepwalking and sleep terrors are explained, including causes, symptoms and ways to prevent each. Finally, tips are provided for falling asleep fast, such as setting the right temperature, avoiding electronics before bed, and maintaining a regular sleep schedule.