Anger is an instinctive emotion of human beings. It is caused by the lack of satisfaction of instinctive needs. For example, when hunger, thirst, uncomfortable urination or crying and calling cannot be responded by adults, they will inform adults in an angry way. There are two main reasons for anger caused by illness and not sleeping well: first, illness is accompanied by physical discomfort, which is easy to cause self pity and frustration, making children more vulnerable and demanding for the environment; second, under the condition of illness and not sleeping well, poor negative emotional experience leads to children's dissatisfaction with their own state , further generalize to the stimulation in dissatisfied environment, so as to generate anger.<br>
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