The passage persuades readers to get enough sleep by outlining the importance of sleep and the negative consequences of not getting enough rest. It states that while the reasons for sleep are not fully understood, scientists believe the body uses this time to recover and repair damage. The passage then claims that lack of sleep means the body and brain do not function properly, and it lists specific effects like being tired in class, inability to think clearly, risk of accidents, and lack of energy. It concludes by quoting the old saying "early to bed and early to rise" and encourages remembering that the body needs a break when considering bedtime.