Muhammad al-Tunsi, a 45-year-old "mesaharati," or dawn caller bangs his drum and chants to wake people up for night-time sohour meal before sunrise, during the Islamic holy month of Ramadan, at El-Moez Street in historical Fatimid Cairo, Egypt, Wednesday, June 15, 2016 (AP) 

Observant Muslims abstain from eating and drinking from dawn to sunset for the entire month of Ramadan. A single sip of water or a puff of a cigarette is enough to invalidate the fast. 

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