Patients with severe OSA treated with CPAP for at least 3 months.

The group consists of patients diagnosed with severe Obstructive Sleep Apnea (OSA) who have been treated with Continuous Positive Airway Pressure (CPAP) therapy for a minimum of 3 months.

Patients with severe OSA in new access and therefore not yet subjected to CPAP treatment.

This group comprises patients recently diagnosed with severe Obstructive Sleep Apnea (OSA) who have not yet started treatment with Continuous Positive Airway Pressure (CPAP). This cohort will be compared to a group of patients who have been undergoing CPAP therapy for at least 3 months. The primary objective is to assess the presence and severity of cognitive symptoms, commonly referred to as Brain Fog, which includes impairments in memory, attention, and concentration. Participants in this group will complete a one-time assessment, which will involve various scales to evaluate cognitive function, sleep quality, daytime sleepiness, and fatigue levels. This study aims to provide insights into the cognitive impacts of untreated severe OSA, thereby highlighting the potential benefits of initiating CPAP therapy.