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Rapid eye movement sleep without atonia constitutes increased risk for neurodegenerative disorders

REM (rapid eye movement) sleep without atonia (RSWA) is a polysomnographic finding used in diagnosis of REM sleep behavior disorder (RBD). Clinical significance of idiopathic RSWA (iRSWA) unaccompanied by RBD is not known. We designed a prospective study to investigate whether iRSWA constitutes an increased risk for developing neurodegenerative disorders.