Is Your Sleep Cycle Out of Sync? It May Be Genetic

https://www.nytimes.com/2019/08/12/well/mind/is-your-sleep-cycle-out-of-sync-it-may-be-genetic.html

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A Patient's Guide to Sleep Disorders

Sleep disorders fall into these seven groups: Insomnia; Sleep Related Breathing Disorders (apnea); Insomnia; Narcolepsy; Circadian rhythm sleep-wake disorders; Parasomnias; Restless Legs Syndrome.