Spanish Registry of Patients With Sleep Apnea and Daytime Sleepiness

Inclusion Criteria: * Patients who come to the sleep consultation for sleep study results for suspected OSA. * Patients older than 18 years. * Signature of the informed consent. Exclusion Criteria: * Psycho-physical inability to complete questionnaires. * Presence of any previously diagnosed sleep disorder: narcolepsy, insomnia, sleep deprivation (less than 6h/day), regular use of medications hypnotics or sedatives (may be included if you only use a short-acting benzodiazepine or melatonin) and restless legs syndrome. * Patients with \> 50% central apnea or presence of Cheyne-Stokes respiration (CSRsp). * A medical history that may interfere with the objectives of the study or that in the judgment of the investigator compromises the conclusions. * Any medical, social or geographical factor that may endanger the patient compliance. (eg, alcohol consumption (more than 80 g/day in men and more than 60 gr / day in women), absence of stable habitual residence, disorientation or non-compliance history). * Any process, cardiovascular or not, that limits life expectancy to less than one year.