In the third phase, all patients with a confirmed diagnosed of a sleep disorder will be invited to undergo an attended nocturnal polysomnography that will objectively evaluate the presence of sleep-disordered breathing, as well as well as other sleep disorders. EEG activity, nocturnal movements, cardiac rhythm, and oxygen saturation. Studies will be performed in the Community Center of The Atahualpa Project, with multiple channel recordings, including: electroencephalogram, electro-oculogram, electromyogram on chin and legs, electrocardiogram, body position sensors, nasal and oral airflow, oxygen saturation, video and audio recording, and may involve trials of continuous positive airway pressure (CPAP) or other investigations.