All volunteers and stable patients that intend to fast ramadan. Each participant is examined during three separate visits.~The week before Ramadan (Pre-R). the last week of Ramadan (R). the last week of the month following Ramadan (Post-R). Participants that miss one appointement or more are exluded from the study. Patient recrutement is conducted in primary care centers of the state of Monastir, out-patients clinic (Cardiology, Endocrinology) at the emergency department of Fattouma Bourguiba university hospital after a clarified written consent.~All patients benifit of a routine examen and evaluation of the quality of life by Short Form 36 (SF36) test and sleeping by Pittsburg Sleep Quality Index (PQSI) score .
Include participants who intend to practice Ramadan fasting and accept to complete the three part of the study .