If screening with type-3 polygraphy reveals an AHI ≥ 15 and ≤ 30/h of recording time or if subjective sleep time in the concomitant sleep log is less than 4 hours, non-attended polysomnography will be performed to confirm the diagnosis of SA. If type-3 polygraphy shows an AHI of ≥ 30/h recording time, the patient will directly be referred to CPAP therapy.