If one hour of sleep gained or lost on a single night can cause such a large change in traffic accident rates, we as a society may be so sleep deprived that we are teetering on the verge of disaster.

• 一晚上人们增加或减少一小时的睡眠就使交通事故发生这么大的变化，那么对于整个社会来说，人们就更可能会由于睡眠不足而引发灾难。