How everybody is always tired?

Answer 1

We seem to value being busy more than being healthy, so we don't let ourselves get enough sleep choosing to fill our time with other things. Some people oddly take it as a sign of strength to be overtired, as if getting a good night's sleep were a sign of laziness or poor moral character.

Also, not eating healthy foods and getting enough vitamins and minerals can make a person feel tired even when they do get enough sleep.