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．________ Exposure to light during the time when you’re supposed to be sleeping can disturb 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.

　　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”．答案：1～5　FDBAG完形填空

　　(2017·福建普通高中毕业班质量检查)Peter Brownr Heights.This Saturday he will lead a team of 5 members in an attempt to__1__the Simpson Desert on foot in 12 days.Only one team member has ever walked through the centre of the desert without any__2__，and it took him 17 days to complete the__3__．__4__in a cart (车) weighing over 140kg.They’ll need to walk from before sunrise until after sunset to__5__the 33km a day target.And the __6____7__ zero at night.

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