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World Sleep Day，on 21st March，was created to bring attention to the growing number of sleep problems．Sleep is a natural part of human life，but many people in the modern world don't realize it's very important．As a result，sleep problems are quite common．
In 2011，scientists at the University of Athens in Greece did a survey of over 35，000people in 10countries around the world，including China，Belgium and South Africa．Among the people，24percent said that they did not sleep well，31.6percent were diagnosed（诊断） with insomnia（失眠）．In addition，30.7percent of them have visited doctors for help with sleep problems and 11.6percent said that they felt very sleepy during the day．
The survey found that many people suffer the effects of poor quality sleep，some examples can't fall asleep and often wake up in the middle of the night．The main reasons of the problems are pressure（压力） from school or work and a fast pace（节奏） of life，but noise pollution and light pollution also affect sleep and cause poor quality sleep．The survey also found that large numbers of people find it hard to sleep at night．The short term effects of this are tiredness and trouble concentrating（专心）．If this happens for a long time，the risk of gaining weight and having a heart attack may increase．
There are many things you can do to improve the quality of your sleep．First，you should have regular sleep habits．Try to go to bed and wake up around the same time
each day．You also need to make your bedroom a cool，dark，quiet place to sleep so that heat，light and noise do not disturb you．At night，you should also avoid things that contain caffeine，such as chocolate，coffee，tea and many soft drinks，as caffeine may keep you from sleeping．
Getting a good night's sleep is important for everyone．By following the advice
above，you can rest better at night and work better during the day．
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