So you know how sometimes when you're really excited and running around all day, it's hard to fall asleep at night? Well, sometimes when people take medicine to help them sleep, their body gets used to it and it becomes harder for them to fall asleep without it. That's called dependent sleep, and when they stop taking the medicine, they might have trouble sleeping again. That's what is called "rebound insomnia." It's like your body getting used to needing something to help it sleep, and then it gets confused when it doesn't have it anymore. It's important to talk to a doctor if you're having trouble sleeping, so they can help you get back to a good sleep routine without relying on medicine.