83 Key Terms Key Terms sleep-wake schedule routine for going to bed at about the same time each night and getting up at about the same time each morning caffeine substance that produces a temporary increase in activity in the body, making it difficult to sleep tryptophan substance that helps the body make chemicals that help you sleep night-light small lamp, often attached directly to an electrical outlet, that provides dim light during the night 3.3Lesson Learning Outcomes After studying this lesson, you will be able to • create a sleep schedule based on your needs. • explain the best way to take naps. • demonstrate how exercise can help you sleep better. • describe which substances interfere with sleep. • understand how relaxing before bedtime can help you sleep. • demonstrate how to create a comfortable sleep environment. • explain how to control exposure to light before bedtime. Developing Strategies for Getting Enough Sleep Graphic Organizer Graphic Organizer Sleep Tips Write the phrase Improving Sleep in the middle of a graphic organizer like the one shown below. As you read this lesson, brainstorm and write what you learn about techniques for improving sleep in the surrounding circles. Olena Olena Yakobchuk/ShuttYakobchuk/Shutterstock.comocktocers Improving Sleep