Lead author Rob，a psychologist at McGill University，describes in the Science a study in which he either added or __4__ healthy children aged 7 to 11 of one hour of sleep a night over five nights.His __5__，says Rob，was to see if such modest changes in the amount of sleep children get could affect their __6__．The children's teachers were asked to fill out a 10－item standard questionnaire to __7__ the children's attention__8__．ncontrolled sleep—in which the researcher asked parents to allow the __9__ to sleep as they normally would to establish a baseline—those who were reduced an hour's sleep had worse scores on behavior measures than those who were allowed to sleep an hour more.(The parents were asked to __10__ their children's bed times，and while they were able to put the kids to bed an hour earlier when __11__，the youngsters ended up sleeping only about 30 minutes more.) In terms of how __12__ reactive，or sensitive，and how attentive the children were，teachers rated the sleep－restricted students on average 4 points higher than their baseline__13__ temper，frustration and had more.__14__ paying attention.In contrast，the children who slept more showed an average 3－point __15__

　　in these problems.【语篇导读】　这是一篇说明文。主要介绍心理学家对儿童的睡眠时间影响其情感稳定性的研究结果表明：睡眠时间少的儿童普遍比有充足睡眠的儿童更情绪化、易怒。ation

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