Discrepancies Between Subjective and Objective Evaluation of Sleep: Potential Marker for Mild Cognitive Impairment

Abstract

Background and Objective Discrepancies between objective and subjective evaluations of sleep efficiency have been observed in individuals with pathological and healthy aging. Objective sleep evaluation using actigraphy has been proposed as a potential tool for the clinical assessment of mild cognitive impairment (MCI). Methods Habitual sleep at home was evaluated using actigraphy (objective measure) and sleep diaries (subjective measure) in 45 participants (between 28 and 72 years old). Participants were divided into four groups by age and by diagnosis (MCI and Alzheimer desease). Cognitive and sleep measures were analyzed for comparisons and correlations. Results Significant discrepancies between objective and subjective sleep efficiency were observed in healthy and pathological ages. The MCI group showed the lowest sleep efficiency compared to other groups. Correlation analysis revealed a significant relationship between cognitive impairments and sleep efficiency in MCI and AD groups. Conclusions Objective sleep evaluation, with a particular focus on sleep efficiency, should be considered as a potential marker for MCI.

Keywords

• sleep efficiency
• healthy and pathological ageing
• alzheimer disease
• mild cognitive impairment