Scientists do not know exactly why people need sleep, but studies show that sleep is necessary for survival. Sleep appears to be necessary for the nervous system to work properly. While too little sleep one night may leave us feeling drowsy and unable to concentrate the next day, a long period of too little sleep leads to poor memory and physical performance. Hallucinations (experiencing things that aren’t there), vision problems, and mood swings may develop if sleep deprivation continues.

Exercise is good for your health. Regular physical activity helps a person have stronger bones and muscles, helps control body fat, helps prevent certain illnesses, and contributes to a good outlook on life. Regular exercise helps promote digestion and a good night’s sleep. When children exercise as part of their busy lives, they are better equipped to manage a busy day's physical and emotional challenges. Many governments and organizations recommend at least 150 minutes of moderate-intensity physical activity weekly.