That is why traveling in a westward direction is more body-clock friendly than flying east. NASA studies of long haul pilots showed that westward travel was associated with significantly better sleep quantity and quality than eastward flights.

　　When flying west, you are extending your day, thus traveling in the natural direction of your internal clock. Flying eastward will involve shrinking or reducing your day and is in direct opposition to your internal clocks natural tendency.

　　One of the more common complaints of travelers is that their sleep becomes disrupted. There aremany reasons for this: changing time zones and schedules, changing light and activity levels, trying tosleep when your body clock is programmed to be awake, disruption of the internal biological clock andworking longer hours.

　　It is often suggested that you adjust your watch as soon as you board a plane, supposedly to try to help you adjust to your destinations schedule as soon as you arrive. But it can take the body clock several days to several weeks to fully adjust to a new time zone.

　　So, our body clock truly can govern us.

　　31.The role of the body clock is to.

　　A. enable us to sleep 6 hours a day

　　B. help us adapt to a 24-hour cycle

　　C. regulate the bodys functions

　　D. interfere with the bodys functions

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