Association Between Metabolic Associated Fatty Liver Disease and Obstructive Sleep Apnea

* Patients with a clinical suspicion of sleep-disordered breathing will undergo overnight polysomnography and the followings indices will be recorded(apnea-hypopnea index (AHI); oxygen desaturation index (ODI); lowest arterial oxyhemoglobin saturation during sleep(LaSO2); mean arterial oxyhemoglobin saturation during sleep(mean SpO2); and %sleep time in which SpO2 \< 90%.( TS90%). * Diagnosis of MAFLD will made when a patient has BMI \>25 kg/m2, T2DM or at least two metabolic risk abnormalities. * All patients will undergo data pertaining to clinical history (name, age, sex, residence, occupation, co-morbidities… diabetes, hyperlipidemia, hypertension, ischemic heart disease, special habits; such as alcohol intake and smoking). * Four anthropometric measurements will be obtained (height, weight, body mass index, waist circumference (WC)). * Blood samples will be collected for doing liver function tests, lipid profile, CBC, HbA1c.