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To investigate whether sleep parameters are associated with improvement in working memory among patients with Parkinson disease (PD) or dementia with Lewy bodies (DLB), researchers conducted overnight polysomnography for 2 nights, followed by cognitive testing, in 53 patients with PD (most without dementia) and 10 patients with DLB. After each night of polysomnography, participants performed digit-span testing four times, beginning 2 hours after awakening and repeated every 2 to 3 hours. The digit-span forward task tested short-term memory, and the digit-span backward task tested working memory.
Sleep parameters did not differ among PD patients who were or were not taking dopaminergic medication and DLB patients. Based on the mean difference…