A wakefulness-promoting agent is like a special medicine that helps you stay awake when you're feeling very, very tired. It's kind of like a superhero for when you need to be awake and alert, but your body wants to rest. Sometimes people need this medicine if they have a sickness, like narcolepsy, which makes it hard to stay awake. Other times, people might use it to help them stay focused when they have a lot of studying or work to do. But it's important to only use it when a grown-up doctor says it's okay, because it can have side effects if you take too much or if it's not right for you.