2．__2__Wait at least three hours after dinner before going to sleep.Digestion slows down while asleep，and a full stomach may interrupt sleep.Similarly，you should avoid going to bed on an empty stomach，as a completely empty stomach may equally disturb your sleeping patterns.

　　3．__3__Exposure to light during the time when you’re supposed to be sleeping can disrupt your body’s internal clock.Turn your light off，or use a very dim night light.__4__They include windows，LED clocks，computer lights and cable boxes.

　　4．Change your sleeping position.You may think that it’s impossible to control what position you sleep in since you aren’t fully aware of what you are doing，but it is possible and it can make a considerable difference.__5__

　　A．Try to avoid all sources of light.

　　B．Keep the room as dark as possible.

　　C．Make note of unusual circumstances.

　　D．Be mindful of what you eat or drink before bed.

　　E．Sleep is considered to be adequate only when there is no daytime sleepiness.

　　F．In other words，sudden change of sleeping time will affect your “biological clock”．

　　G．If you wake up in the middle of the night，make an effort to have a comfortable position.

　　答案1．F　2.D　3.B　4.A　5.G

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