Our brain is like a radio station that sends out different types of waves. These waves are called Beta, Theta, Alpha, and Delta. Each wave has a different job. For example, Beta waves are like the busy bees of our brain. They are active when we are thinking hard, feeling stressed, or dealing with problems. On the other hand, Theta waves are like the calm butterflies of our brain. They come out when we are relaxed, daydreaming, or sleeping.