[解析]
(1)G 考查上下文理解.根据上文提到Some researchers,parents and teachers have suggested that high﹣school classes begin later in the morning to accommodate (适应) teens' needs for more sleep许研究者,父母和老师建议高中的课程开始晚些,让青少年有更多的睡眠时间,故选G一些学校已经执行这个时间.
(2)A 考查上下文理解.根据上文提到Going to bed at the same time each night signals to your body that it's time to sleep.每晚同样的睡眠时间提示你的身体该睡觉了,故选A每天同一时间醒来可以建议睡眠的模式.
(3)D 考查上下文理解.根据上文提到Exercise regularly有规律的锻炼,故选D不在要睡觉前锻炼因这会让你更难入睡.
(4)E 考查上下文理解.根据上文提到Don't drink beverages with caffeine,such as soda and coffee,after 4 pm四点之后不要喝有咖啡因的饮料,故选E尼古丁是一种刺激性的东西,因为戒烟能帮你更好的睡眠.
(5)B 考查上下文理解.根据上文提到Create the right sleeping environment创造一个好的睡眠环境,故选B在黑暗的房间时通常会睡得最好.