赵亮下午上课时注意力经常不能集中,甚至会打瞌睡。为此,赵亮挨了老师好几次批评。赵亮感到很苦恼,上午还精力充沛,情绪饱满,学习状态很好,可一到下午就头昏脑涨,精神不振,注意力下降。是不是身体有毛病了?在妈妈的陪同下,赵亮去医院检查,结果赵亮很健康,心理医生说是生物钟在起作用。赵亮不明白,生物钟是怎么一回事呢?医生解释说,我们很多人都有这样的体 Zhao Liang Attention in the afternoon often can not focus, or even doze off. To this end, Zhao Liang repeatedly criticized the teacher. Zhao Liang was very upset, still energetic in the morning, full of emotions, good learning status, but dizzy in the afternoon, lack of energy and decreased concentration. Is not a physical problem? Accompanied by his mother, Zhao Liang went to the hospital for examination, the results of Zhao Liang is very healthy, the psychiatrist said that the biological clock at work. Zhao Liang do not understand, how is the biological clock? The doctor explained that many of us have such a body