Why You Need Sleep The average kid has a busy day. There's school, taking care of your pets, running around with friends, going to sports practice or other activities, and doing your homework. Phew! It's tiring just writing it all down. By the end of the day, your body needs a break. Sleep allows your body to rest for the next day. Everything that's alive needs sleep to survive. Even your dog or cat curls up for naps. Animals sleep for the same reason you do - to give your body a tiny vacation. Not only is sleep necessary for your body, it's important for your brain, too. Though no one is exactly sure what work the brain does when you're asleep, some scientists think that the brain sorts through and stores information, replaces chemicals, and solves problems while you snooze. Most kids between 5 and 12 get about 9.5 hours a night, but experts agree that most need 10 or 11 hours each night. Sleep is an individual thing and some kids need more than others. When your body doesn't have enough hours to rest, you may feel tired or cranky, or you may be unable to think clearly. You might have a hard time following directions, or you might have an argument with a friend over something really stupid. A school assignment that's normally easy may feel impossible, or you may feel clumsy playing your favorite sport or instrument. One more reason to get enough sleep: If you don't, you may not grow as well. That's right, researchers believe too little sleep can affect growth and your immune system - which keeps you from getting sick. The Stages of Sleep Stage 1 In this stage, your brain gives the signal to your muscles to relax. It also tells your heart to beat a little slower, and your body temperature drops a bit. Stage 2 After a little while, you enter stage 2, which is a light sleep. You can still be woken up easily during this stage. For example, if your sister pokes you or you hear a car horn outside, you'll probably wake up. Stage 3 When you're in this stage, you're in a deeper sleep, also called slow-wave sleep. Your brain sends a message to your blood pressure to get lower. Your body isn't sensitive to the temperature of the air around you, which means that you won't notice if it's a little hot or cold in your room. It's much harder to be awakened when you're in this stage, but some people may sleepwalk or talk in their sleep at this point. Stage 4 This is the deepest sleep yet and is also considered slow-wave sleep. It's very hard to wake up from this stage of sleep, and if you do wake up, you're sure to be out of it and confused for at least a few minutes. Like they do in stage 3, some people may sleepwalk or talk in their sleep when going from stage 4 to a lighter stage of sleep.

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