We all get them, and we all can’t stand how they look: dark circles under eyes!! While common knowledge (and loads of articles!) says they are caused by lifestyle factors, like lack of sleep and poor diet, research actually supports the idea that sleep may not be the whole reason we get them. So, we’ve looked into what, exactly, researchers agree causes dark circles, the best ingredients they’ve studied to fix them, and the best make up tips to cover them up. With this Guide, your days of raccoon eyes are numbered!