Then I learned that the problem was acid reflux, a relatively common condition in which stomach acid comes back up the esophagus and scalds the vocal cords, usually during sleep.
后来我了解到起因是胃酸倒流，这是很多人都会碰到的情况：通常在睡觉的时候，胃酸回流经过食道，烧伤了声带。
This type of sleep apnea is caused by a failure, during sleep, of the brain's control of the breathing process. In this condition snoring is usually absent.
这一病症是由睡眠过程中脑部对呼吸作用失去控制导致的。
Blood pressure usually falls during the sleep cycle.
血压通常在睡眠周期中降低。
US researchers studied the brain activity of rats kept awake during the day - the time they would usually sleep.
美国的研究人员进行了一项实验，他们让一种习惯昼伏夜出的小老鼠白天不睡觉，以此来研究它们大脑的活动情况。
The reason was due to a shutdown of parts of the brain regions due to sleep deprivation and the filling up of the short term memory that was usually filed and emptied during periods of sleep.
其原因是，由于被剥夺了睡眠，大脑充满了以往在睡觉过程中存档或清空的短期记忆，使大脑区域部分停工。
Koalas usually sleep during the day, but get up and eat leaves at night.
考拉通常白天睡觉，但晚上却起来吃叶子。
Going to sleep no more than an hour later or waking up no later than 2 to 3 hours longer than you would usually do during the week.
周末的时候，睡觉时间不能比平时晚一小时以上，起床时间不能比平时晚超过2到3小时。
During pregnancy, women usually because of nausea, back pain, frequent toilet and heart pain and could not sleep.
怀孕期间，女人通常会因为恶心、背痛、频繁上厕所和心痛而不能入睡。
Usually restless legs syndrome behaved serious in the rest and disappeared after activity. It much occur during the nocturnal sleep at middle age people.
症状与体征分离，安静状态下表现严重，活动后反而消失，多发生在夜间睡眠时。
Usually restless legs syndrome behaved serious in the rest and disappeared after activity. It much occur during the nocturnal sleep at middle age people.
症状与体征分离，安静状态下表现严重，活动后反而消失，多发生在夜间睡眠时。
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