When it comes to sleep, there’s a lot to learn, and scientists are still trying to figure out a lot of things. One of the more common questions we get is how much sleep people actually need. In the third of our 11 weekly infographics (which, when tallied up, will feature 80 facts about sleep) we provide information on how much sleep is needed for different age groups, plus some facts on what happens to you body if you don’t get enough.