This is an old English proverb. This means that we should go to bed early at night and get up early in the morning. If we do this, we will be healthy. We will also become rich and smart.
Is it true?/You don't say. Maybe it is. The body must have enough sleep. Children your age need ten hours' sleep every night. If you don't go to bed early, you won't get enough sleep. Then you can't think hard and work hard. You won't be smart or rich!
Some people go to bed late at night and get up late in the morning. This is not good for them. We should sleep when it is dark. Darkness helps us sleep well. We should get up at dawn. It's time for exercise. When the body is not used, it will become weak. Exercise keeps it strong.
Exercise helps blood flow in the body. This is very important. Blood needs nutrition. To all parts of our bodies. The brain in our head also needs blood. We think with our brains. If we keep healthy and exercise, we can think better!
Our bodies also need air to breathe. Without air, we will die. Get up early in the morning, we can breathe a lot of clean and fresh air. This will keep us healthy and happy.