Video narration
Why do your eyes get heavy after lunch? You might blame the meal, or think digestion explains it all. But lunch isn't always the cause. Your alertness often dips in the afternoon, around the time you eat. A big meal can deepen that dip, and too little sleep can make it feel stronger. So your afternoon body-clock dip is often the answer; a big meal or too little sleep can intensify it. Follow for more body hacks.