Lt helps your body grow. And sleep is very important for your brain, too. Your brain is the command center for your body. All day long your brain is hard at work. Lt takes in all kinds of information. Lt uses that information to tell your body how to respond. For example, on a hot day you might feel very warm. Your brain sends signals to your skin to make you sweat so that you’ll cool off. As you’re playing baseball, your eyes tell your brain that a ball is flying toward you. Your brain sends signals to your arms. You swing the bat and hit the ball ! Your brain takes charge of mental tasks, too. Lt tells you how to spell words on your spelling test. Lt stores facts like your telephone number. Lt remembers the multiplication table. Every moment of every day, your brain is busy.