Julie usually wakes up very tired each morning, but she wants to improve her ability to function during the day. She decides that she will go to sleep an hour earlier than usual from now on. The first night, she has trouble falling asleep, and when she wakes up tired, she abandons her plan. What is the best advice one could give Julie about her plan and getting more sleep? A. Scientists don’t know much about why we sleep. You can’t really do anything about it. B. It is usually better to go to sleep later, since you’ll be more tired. C. Forming new habits takes time. Stick with your plan. D. Going to sleep earlier would never have helped. Try something else.