Teachers’ working hours go far beyond the 8 a．m. to 5 p．m. schedule of kids in school.There are hours spent at staff meetings，correcting homework，preparing for the next day—and then there is the worrying.What I did in a hospital emergency room required no more intensive mental energy than what is needed to keep 30 kids attentive enough to learn what I was teaching.

　　Good teachers are like magicians keeping a dozen balls in the air to come at right time，with alarm set for 6 a．m. to finish grading papers，memories of the day that’s gone—including the students who didn’t understand something，forgot their lunch or were embarrassed by wrong answers.All these will become sleep­resistant barriers.And also with some financial stress，you’ll have a cycle of insomnia(失眠)with unwelcome consequences.

　　With inadequate sleep comes irritability(易怒)，forgetfulness，lower tolerance of even minor annoyances，and less efficient organization and planning.These are the very mental muscles that teachers need to meet the challenges of the next day.In wanting to do a better job the next day，the brain keeps bringing up the worries that deny the rest it needs.

　　语篇解读　本文是一篇科普类文章。该文讲述了老师们为什么经常有睡眠问题或失眠，主要是因为老师们对教育的奉献以及所要面临的各种压力，使得他们忽略了身体所需的睡眠。1．After a bad night’s sleep，usually the direct effect for the next day is to ________.

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