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It is early in the morning and I've hardly caught any shuteye. My breakfast of eggs，bread and strong coffee will keep me awake and alert before lunch.After lunch，I will face an afternoon of yawning in the office.Sometimes I feel uneasy about this situation but I am sure that I am not alone，for it is not too much to say that we all seem to be yawning more often.Are we turning into a generation of insomniacs (患失眠症的人)? How is modern life influencing our sleep patterns?
We can start by blaming the light bulb and other forms of manmade light.Experts say that on average people go to bed and wake up two hours later than the previous generation.Then，there are the computers.Research led by Professor Charles Czeisler of Harvard Medical School has shown that people who read electronic books before going to bed take longer time to fall asleep.They have lower levels of melatonin，a chemical which controls our body clock.And they're less active in the morning.Professor Czeisler said，“In the past 50 years，there has been a decrease in average sleep length and quality.Since more people are choosing electronic devices for reading，communication and entertainment，especially teenagers who already experience serious sleep loss，research on the longterm influence of these devices on health and safety is urgently needed.”
So the first thing to do if you want to have a restful night is leave computers out of the bedroom.The earlier you get your fingers off the keyboard，the sooner you tend to fall asleep.Avoid alcohol，as it might reduce our cycles of the “rapid eye movement” sleep，when our brains process the information we have received during the day.It prevents our brain activity going well.And do not eat nuts or cheese in the evening.
After that，if you still cannot sleep，start counting sheep.Maybe that is the best way to avoid another afternoon of yawning in the office.
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【参考范文】
Modern people suffer from sleeplessness and consequently get into a state of tiredness easily.(要点1) This phenomenon results from the negative effects of artificial light and computers.(要点2) So in order to solve the problem，people are advised to reject computers，resist alcohol as well as refuse nuts or cheese before bedtime.(要点3)Even counting sheep may help solve the problem in some way.(要点4)
