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"You do not feel the stimulating effects of caffeine immediately after your first sip of coffee", said Dr Michael Grandner, director of the sleep and health research programme at the University of Arizona after being interviewed by The Straits Times. "It takes about 20 to 30 minutes for caffeine to be absorbed into the bloodstream, reach the brain and make you feel more alert, he said."
Dr. Michael Grandner, the director of the Sleep and Health Research Program at the University of Arizona, told the American Heart Association: “If you’re napping because it helps you get through the day, that’s probably a good thing.”