This document summarizes different sleep disorders and disturbances. It discusses insomnia, characterized by difficulty falling asleep or staying asleep. It also covers narcolepsy, where people uncontrollably fall asleep during the day. Sleep apnea is described as breathing difficulties or cessations while sleeping. Hypersomnia is summarized as too much sleep during the day and night. The document also briefly outlines somnambulism (sleepwalking), nightmares, and night terrors. Possible causes and treatments are provided for each condition.