I think that the number of hours of sleep we need depends on the activities you do and your age. If you are a baby, you will need a lot of sleep,12-18 hours, an average third grader will need somewhat 10 hours, a tween or teens will need 8-10, about nine hours. Seniors and grown ups need less sleep.
The number of sleep you need depends on your age because different age groups do different things. A baby will need lots of sleep because they are small, and young. Third graders or older, thus they don’t need that much sleep. But they still need a fair amount, because they do more and different activities than babies. Tweens have more work to do so they might need an average of 9-10 hours and teens will need 8-9 hours. Grown ups may need an equivalent amount of a little less sleep than teens. Seniors take naps in the middle of the day, so they don’t need that much sleep. They sometimes go to sleep very late, having 5-7 hours.
The number of activities you do and how tired you are also depend on the amount of sleep up needed. If you are a pro basketball player, you will either need very little of a lot of sleep. But most just party all night after games. If you do sports, especially late night games of travel games, you would need lots of sleep to recharge your energy after a game. If you spent your time reading, you wouldn’t need as much sleep as a sports player. Basically, the amount of sleep you need depends on what you do. If you play tiring sport games, you will need more sleep, while a person who reads wouldn’t use up that much energy.