신천중 중2 2026 1학기 기말고사 영어 내신 분석

How much sleep do we need? In a study, researchers found that teenagers need 8 to 10 hours of sleep each night. ⓐAt the same time, the quality of sleep matters, too. Good sleep can help you stay healthy and focused during the day. ⓑHowever, poor sleep can make learning and remembering things difficult. ⓒHere is a simple tip for having a deep sleep. Put your phone down 30 minutes to an hour before you go to bed. ⓓMany teenagers spend several hours a day doing various sports and physical activities. ⓔLooking at videos or messages keeps your brain active. So, if you bring your phone to bed, you may have trouble falling asleep.