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 35,000 people in 10 countries around the world, including China, Belgium and South Africa. Among the people, 24 percent said that they did not sleep well, 31.6 percent were diagnosed (诊断) with insomnia (失眠). In addition, 30.7 percent of them have visited doctors for help with sleep problems and 11.6 percent said that they felt very sleepy during the day.
The survey found that many people suffer the effects of poor quality sleep, some even can’t fall asleep and often wake up in the middle of the night. The main reasons of the problems are pressures (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.

Have a good sleep
World Sleep Day	World Sleep Day was created to make people understand the of sleep.
A survey by scientists	Of 35 000 people in 10 countries in the world, there were 24 percent of the people    they didn’t sleep well. 31.6 percent were diagnosed with insomnia. 30.7 percent have   to a doctor for sleep problems. 11.6 percent of the people feel sleepy during the day .
of sleep problems	People feel the pressure from school or work . A fast pace of life    to sleep problems as well. Noise and light pollution also     sleep and cause poor quality sleep.
Results of sleep problems	Some people aren’t    to fall asleep easily and often wake up at night. Feeling   , people find it hard to concentrate. It’s highly possible that sleepless people easily gain weight and have a heart attack.
to improve sleep quality	Have regular sleep habits. Make your bedroom cool, dark and quiet Don’t drink anything    caffeine at bedtime.