This document summarizes several common sleep disorders: insomnia, sleep apnea, parasomnia, sleep paralysis, hypersomnia, sleepwalking, narcolepsy, snoring, restless legs syndrome, and circadian rhythm sleep disorders. Insomnia involves difficulty falling or staying asleep. Sleep apnea interrupts breathing during sleep and is associated with health risks. Parasomnia describes night terrors that typically affect children. Sleep paralysis occurs upon waking when one is conscious but unable to move. Hypersomnia makes people susceptible to excessive daytime sleepiness. Sleepwalking involves performing activities while still asleep. Narcolepsy involves sudden sleepiness and other symptoms like cataplexy. Snoring is caused by airway obstructions and may indicate sleep ap