Sleep Apnoea Syndrome Without Chronic Heart Failure

Inclusion Criteria: * patients with supected sleep apnoea syndrome and scheduled diagnosis at a sleep laboratory * male and female patients aged at least 18 years * persons who understand and follow the instructions of the study staff * singed informed consent Exclusion Criteria: * persons being housed in an institution by court or governmental order * pregnancy or breastfeeding * patients who are not able to consent * acute or chronic inflammations of the external and middle auditory canal * abnormal anatomic proportionsof the external and middle auditory canal which are pathological or congenital, for example limitation of the auditory canal * persons in a dependence or in an employment contract to the investigator * participation in another study at the same time