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Figure 2 :Study 2. Mean and standard error (for CAR1, CAR2 and SSQ) in relation to the equivalent noise levels. P-values were calculated with ANOVAs (CAR1: Increase of cortisol concentration within 45 minutes post-awakening, left panel, CAR2: Area under curve calculated over the post-awakening cortisol concentrations minus the concentration upon awakening (C0), SSQ: Subjective sleep quality).

Figure 2 :Study 2. Mean and standard error (for CAR1, CAR2 and SSQ) in relation to the equivalent noise levels. P-values were calculated with ANOVAs (CAR1: Increase of cortisol concentration within 45 minutes post-awakening, left panel, CAR2: Area under curve calculated over the post-awakening cortisol concentrations minus the concentration upon awakening (C0), SSQ: Subjective sleep quality).