Sleep quality modifies the association between nocturnal sleep, daytime napping, and mild cognitive impairment: A population-based dose-response study

These findings indicate that, in this cross-sectional sample, 7-8 h of nocturnal sleep combined with 30-60 min of daytime napping were associated with better cognitive status, whereas long sleep with poor sleep quality was associated with higher odds of impairment. These observational associations, considered within a circadian-homeostatic framework, are hypothesis-generating and warrant confirmation in future longitudinal and interventional studies.