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。

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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。

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Blood pressure usually falls during the sleep cycle.

血压通常在睡眠周期中降低。

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Before your trip, your doctor can advise whether melatonin is a good option for you and if so, the appropriate amount to take and when to take it (usually about an hour before the desired sleep time and either upon your return, during your trip, or both).

CNN: Can melatonin prevent jet lag?