Multidisciplinary Sleep Unit, Department of Respiratory Medicine, Hospital Universitari de Bellvitge, L'Hospitalet de Llobregat, Spain. Section of Respiratory Medicine, Bellvitge Biomedical Research Institute (IDIBELL), L'Hospitalet de Llobregat, Spain. Centro de Investigación Biomédica en Red de Enfermedades Respiratorias (CIBERES), Spain. Section of Endocrinology, Bellvitge Biomedical Research Institute (IDIBELL), L'Hospitalet de Llobregat, Spain. Department of Endocrinology and Nutrition Department, Hospital Universitari de Bellvitge, L'Hospitalet de Llobregat, Spain. CIBER de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM-CIBER), Spain. Department of Rehabilitation, Hospital Universitari de Bellvitge, L'Hospitalet de Llobregat, Spain. Department of Medicine, Universitat de Barcelona, Campus Bellvitge, L'Hospitalet de Llobregat, Spain. Respiratory Medicine Department, Hospital Universitari Sagrat Cor, Barcelona, Spain. LINDE Healthcare, Spain.