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This study investigates changes in nighttime sleep duration in relation to cognitive decline and risk of incident dementia. A total of 3057 participants from the Swedish population study ‘Good Aging in Skåne’ (Mage = 68.4) with normal baseline sleep duration (6–8 h) were followed up to 20 years (Myears = 8.39). Self-reported change was defined as shortened or prolonged if participants lost or gain
