早睡早起身体好。这句话每个人都知道，可是能做到的人却不多。整天被网络、手机、游戏围绕的年轻一代，每天的睡眠时间估计很难达到健康生活的标准。是的，他们都是有"睡眠负债"的人。
Sleep debt is the cumulative effect of not getting enough sleep. A large sleep debt may lead to mental and/or physical fatigue.
睡眠负债指长期睡眠不足产生的影响。睡眠负债过多可能会导致精神或身体疲惫。
here are presumed to be two kinds of sleep debt, caused by partial sleep deprivation or total sleep deprivation. Partial sleep deprivation occurs when a person sleeps too little for many days or weeks. Total sleep deprivation means being kept awake for days or weeks.
睡眠负债的来源有两种：部分睡眠不足和整体睡眠不足。前者指一个人连续几天或几周每天都睡很短的时间；后者则指一个人连续几天或几周不合眼。
A long-term sleep debt may cause emotional upset, compromise work performance, weaken memory, alertness, attention as well as judgment. It may also speed up one's ageing process and lead to other types of diseases.
长期处于睡眠负债的状况中，不但会影响情绪、工作表现、还会减低记忆力、警觉性、注意力和判断力、并且加速老化，甚至引发其它疾病。

• mental [´mentl] a.精神的；心理的 (初中英语单词)
• physical [´fizikəl] a.物质的；有形的 (初中英语单词)
• emotional [i´məuʃənəl] a.易动感情的；情感的 (初中英语单词)
• performance [pə´fɔ:məns] n.履行；行为；工作 (初中英语单词)
• compromise [´kɔmprəmaiz] n.妥协，和解 (高中英语单词)
• weaken [´wi:kən] v.(使)弱化；衰弱；稀薄 (高中英语单词)
• partial [´pɑ:ʃəl] a.部分的；偏袒的 (英语四级单词)