Many of us wake up feeling【小题1】(tire) in the morning. Many of us ignore the problem as the day goes on,【小题2】(forget) that it might have a【小题3】(danger) effect. Society even glorifies “burning the candle at both ends” as【小题4】sign of our devotion to work and family.

Believe it【小题5】not, all this bad sleep has far-reaching consequences. We just do not give ourselves enough chances to sleep. A survey of over 74,000 people found 35 percent reported sleeping less than seven hours daily【小题6】average. Furthermore, the amount of sleep【小题7】(change) greatly over the past 15 years.

This lack of sleep can lead of many serious【小题8】(problem). One study found that【小题9】(simple) limiting yourself to six hours of sleep a night for two weeks had similar effects to staying up all night the night before,【小题10】could make you perform poorly on a timed attention task.