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RL), the arousal index, and sleep efficiency(SE). Pearson correlation analysis, ANOVA and Chi 2 were performed. (p b 0,05). Results: The mean age of 36 subjects was 67,28 ± 8,16 years and 20 were females (55.55%). SE positively correlated with MMSE´s score (r = 0.36), DS (r = 0.38), block design (r = 0.41) and inversely correlated with TMTA (r = − 0.39), number of false recognition responses (r = − 0.37) and sum of intrusions(r = − 0.41) in RAVLT.RL is inversely correlated with TMTA(r = − 0.36).The other sleep variables showed non correlations with results of cognitive tests. Conclusion:In our sample, MCI patients with lower sleep efficiency showed worse perfomance in visuospatial skills, executive functions and orbitofrontal functioning, while a longer RL correlated with better performance in attention.