After school on Tuesday, Kevin feels very tired. He has five classes in the morning and a long gym class in the afternoon. The gym class includes many exercises and a 400-meter run. By the time he gets home, his legs are heavy and his eyes keep closing. He drops his bag on the floor and falls onto the sofa without taking off his shoes.
Kevin is too tired to do his homework right away. He tries to open his notebook, but the letters on the page look blurry. He is too sleepy to answer his mom's questions. She asks him what he wants for dinner, but he just shakes his head. His mom lets him rest on the sofa for a while before calling him to the dinner table.
Kevin's older sister, Lisa, never has this problem. She goes to bed at ten o'clock every night and wakes up early to review her notes. Because of her good habits, she is always fresh enough to focus during class and energetic enough to finish all her homework before dinner. Her grades are always good, and she never complains about being tired. Kevin admires her and decides to take better care of himself.
After a thirty-minute rest, Kevin wakes up feeling much better. He is now awake enough to read one chapter of his English textbook. He finishes all his homework before nine o'clock and goes to bed early. The next morning, he feels strong enough to walk to school without complaining. He smiles to himself and thinks, "A good rest really makes a big difference."