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A mutant gene rather than anti social tendencies may be the cause of people going to sleep and waking up unsociably early, scientists said on Wednesday. 科學(xué)家周三稱有些人睡得異乎尋常地早，而醒得也早是由一種突變基因決定的，而不是他們追求逆反社會潮流的結(jié)果。