In the YouTube video "Why Are You Always Tired?", it is explained that some people are always tired because of a lack of physical activity and a poor diet, and coffee can make you more sleepy. However, consuming coffee or energy drinks less than 6 hours before bed can ultimately affect your sleep quality. If you're not getting the sleep you need, talk to your physician. Additionally, around 20% of the population have genetics that make them predisposed to staying up late, but living in a 9-to-5 world can make it difficult to get the proper amount of sleep.