Sleep studies haven't yet concluded whether there are benefits to these brief intervals, like when you nod off on someone's shoulder on the train.
短的就像你在火车上不小心靠着别人的肩头打了个小盹，睡眠研究对如此简短的盹是否对人体有好处尚未定论。
The findings may explain why parents instinctively rock babies to sleep, and why we find it so easy to nod off when slumped in a rocking chair, they add.
他们还说，这项发现或许可以解释父母本能的摇晃婴儿睡觉的原因，也可以解释为何我们一躺在摇椅上就会打盹。
A chronic lack of sleep may cause far more serious problems than a tendency to nod off the next day, researchers warn.
科学家警告说，长期睡眠不足可导致的问题也许会比白天老打瞌睡更严重。
This exposure impairs melatonin production and interferes with your ability to fall asleep as well as with the quality of your sleep once you do nod off.
这种照射会削弱褪黑色素的产生，从而影响你睡眠，即使睡着，也会影响睡眠质量。
Years of scientific research have found that your body temperature is key when trying to get to sleep, as your body temperature naturally drops when you start to nod off.
多年的科学研究发现想要睡觉的时候身体温度是关键，因为你在开始有睡意的时候身体的温度就在下降。
Years of scientific research have found that your body temperature is key when trying to get to sleep, as your body temperature naturally drops when you start to nod off.
多年的科学研究发现想要睡觉的时候身体温度是关键，因为你在开始有睡意的时候身体的温度就在下降。
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