When it comes to sleep, there’s a lot to learn, and scientists are still trying to figure out a lot of things. Something that seems fairly obvious is that sleep is universal — we all need it. Unfortunately, though, a significant percentage of people aren’t sleeping the proper amount. In the fifth of our 11 weekly infographics (which, when tallied up, will feature 80 facts about sleep) we provide information on sleep around the world, and who isn’t getting enough of it.