题目内容：

    Sticking to your body’s natural sleep-wake cycle is one of the most important strategies for achieving good sleep. If you keep a regular sleep schedule, you will feel much more refreshed and energized than if you sleep the same number of hours at different times. This holds true even if you change your sleep schedule by only an hour or two.1. Try the following ways to help you stick to your body clock, and you will have a better sleep.

2. Keeping a regular sleep-wake schedule helps set your body’s internal clock and improve the quality of your sleep. Start by setting realistic bedtime that will work with your lifestyle.3. If you’re getting enough sleep, you should wake up naturally without an alarm. If you need an alarm clock to wake up on time, you may need to set earlier bedtime.

Avoid sleeping in — even on weekends or nights you’ve stayed up late.4. If you need to make up for late night, choose a daytime nap rather than sleeping in. This way allows you to pay off your sleep debt with disturbing your natural sleep-wake rhythm.

Be smart about napping. As mentioned above, napping is a good way to recharge and make up for lost sleep hours. But if you tend to have trouble falling asleep or staying asleep throughout the night, napping can make things worse.5. Besides, limiting them to 15 to 20 minutes in the early afternoon is a good idea.

A.Never sleep after dinner.

B.Consistency is vitally important.

C.Try to go to sleep and get up at the same time every day.

D.Don’t turn to sleeping pills every time you can’t sleep quickly.

E.If sleeplessness is a problem for you，consider ridding naps altogether.

F.Choose a time when you normally feel tired, so that you will fall fast asleep.

G.The more your weekend / weekday sleep schedules differ, the worse the jet lag-like symptoms you will experience.