Why do I get sleepy in the afternoon?

According to TheHealthSite, drowsiness occurs in the afternoon as a result of the body's natural circadian rhythms. Circadian rhythms are biological processes that occur at the same time every day, Getting enough sleep the night before can increase energy during the day.

Many people attempt to beat the afternoon slump with caffeine or sugar. TheHealthSite warns that this is unhealthy because they may cause decreased energy later in the day. TheHealthSite suggests ways to boost energy and decrease drowsiness during the afternoon, such as going for a brief walk in the sun, having a conversation with a friend, staying hydrated throughout the day, eating fewer carbohydrates and taking a nap.