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Figure 1 :Study 1. Mean and standard error for the cortisol awakening response (CAR1, left panel) and subjective sleep quality (SSQ, right panel) in relation to the type of train noise (due to different brakes), the number of pass-bys and the equivalent noise level. P-values were calculated with ANOVAs (CAR1: increase of cortisol concentration within 45 minutes post-awakening).

Figure 1 :Study 1. Mean and standard error for the cortisol awakening response (CAR1, left panel) and subjective sleep quality (SSQ, right panel) in relation to the type of train noise (due to different brakes), the number of pass-bys and the equivalent noise level. P-values were calculated with ANOVAs (CAR1: increase of cortisol concentration within 45 minutes post-awakening).