Question: why do people get tired

Bernice Ridley answered on 8 Mar 2023:

Every day we use a huge amount of energy to keep our bodies moving. Sleep is a way that we can recover, lower our energy demands and allow more repair to go on. Feeling tired is just our bodies’ way to tell us to get some rest. Of course, you all have a daily rhythm that is specific to you, and you feel tired at different times of the day to others. There has been research that teenagers’ body clocks are out by two hours which is why they struggle to get up, but I am not sure why this would be the case!