答案和解析来啦：
What keeps you up at night?
是什么让你晚上睡不着？
Pondering deep questions?
思考一些深奥的问题？
Excitement about a big trip?
因旅行而感到兴奋？
Or is it stress about unfinished work, an upcoming test, or a dreaded family gathering?
还是因为各种压力，比如：未完成的工作、即将来临的考试、或是可怕的家庭聚会？
For many people, this stress is temporary, as its cause is quickly resolved.
对很多人来说，这种压力是暂时的，因为这种压力的来源，很快就会消失。
But what if the very thing keeping you awake was stress about losing sleep?
但如果导致失眠的真正原因是因害怕失眠而产生的压力呢？
This seemingly unsolvable loop is at the heart of insomnia, the world’s most common sleep disorder.
这个看似无法解决的循环是失眠的核心——世界上最常见的睡眠障碍。
Almost anything can cause the occasional restless night: a snoring partner, physical pain, or emotional distress.
几乎任何事情都可以引发偶尔的失眠：一位打呼噜的同伴、身体上的疼痛、或是情绪烦恼。
And extreme sleep deprivation like jet lag can throw off your biological clock, wreaking havoc on your sleep schedule.
极度的睡眠剥夺，比如时差综合征会打乱生物钟，破坏作息时间。
But in most cases, sleep deprivation is short-term.
但是大多数情况下，睡眠剥夺是暂时的。
Eventually, exhaustion catches up with all of us.
最终，疲惫会打败所有人。
However, some long-term conditions like respiratory disorders, gastrointestinal problems, and many others can overpower fatigue.
然而，一些长期症状，比如呼吸系统疾病、肠胃问题、或是其它原因，都会击败疲劳。
And as sleepless nights pile up, the bedroom can start to carry associations of restless nights wracked with anxiety.
随着不眠之夜越来越多，卧室开始与未眠之夜相关联，充斥着焦虑。
Come bedtime, insomniacs are stressed.
每到睡眠时间，失眠患者便会感到压力。
解析在这里哦！
1. sleep deprivation，专有名词，表述“睡眠剥夺”。
睡眠剥夺就是指不让人有正常节律的睡觉。
2. jet lag，名词词组 ，表示“时差综合征”，比如：Are you over your jet lag yet?（你是否克服了时差综合征？）
3. exhaustion，名词，表示“精疲力竭”，比如：He is suffering from exhaustion.
（他精疲力竭。）
4. fatigue，名词，表示“疲惫”，比如：She continued to have severe stomach cramps, aches, fatigue, and depression. （她仍有严重的胃痉挛、疼痛、疲惫和抑郁症状。）
5. insomniacs，名词，单词原形为：insomniac，表示“失眠症患者”。
