are you sometime a little tired and sleepy in the early afternoon? if so, you are not the only one. many people feel this way after lunch. they may think that eating lunch is the cause of their sleepiness. or, in summer, they may think it is the heat. however, the real reason lies inside their bodies. at that time-about eight hours after you wake up-your body temperature goes down. this is what makes you slow down and feel sleepy. scientists have tested sleep habits in experimental situations where there was no night or day.