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Distribution of sleep stages in baseline and noise nights and their differences. Comparisons are based on the shorter sleep period time (SPT). Mean values were calculated for each of the n = 48 subjects in order to account for non-independent data. 395 noise and their corresponding baseline nights were analyzed in total. As the assumption of normally distributed data was denied by the Shapiro-Wilk-Test for the differences in Wake and REM non-parametric p-values derived by the Wilcoxon matched pairs signed rank sum test are also given for these categories.

Distribution of sleep stages in baseline and noise nights and their differences. Comparisons are based on the shorter sleep period time (SPT). Mean values were calculated for each of the n = 48
subjects in order to account for non-independent data. 395 noise and their corresponding baseline nights were analyzed in total. As the assumption of normally distributed data was denied by the
Shapiro-Wilk-Test for the differences in Wake and REM non-parametric p-values derived by the Wilcoxon matched pairs signed rank sum test are also given for these categories.