Sleep problems in the aged with mild cognitive impairment

Objective To assess the sleep quality in the aged with mild cognitive impairment (MCI). Methods Altogether 320 MCI elderly and 630 elderly without MCI were assessed the quality of sleeping with the Pittsburgh Sleep Quality Index(PSQI), and cognitive functioning with the Montreal Cognitive Assessment(MoCA) and Mini-Mental State Examination(MMSE). Results There were 34.3 percent of MCI elderly and 27.0 percent of controls had sleep problems, and the difference between the two groups was significant（χ2=7.35，P<0.01）. The mild correlations between the scores of MoCA and PSQI（r=-0.12，P=0.00）, MMSE and PSQI（r=-0.09，P=0.00） were significant. Conclusions The aged with MCI have lower sleep quality than ones with normal cognition, which may be correlated with their cognitive impairments. Key words: Sleep; Mild cognitive impairment; Montreal Cognitive Assessment; Mini-Mental State Examination; Pittsburgh Sleep Quality Index