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Losing just two hours of sleep a night makes people angrier, research reveals. 研究显示，每晚少睡两个小时会让人更易怒。 The study is among the first to prove a direct link with lack of shuteye, experts say. 专家称，这是首个证明生气和睡眠不足有直接联系的研究。 Previous research shows sleep loss increases negative emotions, such as anxiety and sadness, and decreases positive emotions, including happiness and enthusiasm. 之前的研究表明，睡眠不足会增加消极情绪，如焦虑和悲伤，减少积极情绪，包括幸福和热情。 | 
