This sleep disorder puts people at 'very high risk' of Parkinson's

http://www.weny.com/story/40090165/a-certain-sleeping-disorder-may-be-putting-people-at-very-high-risk-of-parkinsons

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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.