STATISTICAL ANALYSIS
The statistical analysis was carried out with SPSS v 23.0 for Windows (SPSS, Chicago, IL) and statistical significance was determined at p<0,05. One-way ANOVA test was used to evaluate BIS averages of SQI groups and comparison of sleep stages according to BIS score averages of SQI values over 70. Post hoc Tukey test was used to compare variables that were found significant.