这些类型的手表在睡眠研究中被用来测量人们的睡眠时长、睡眠效率，以及他们是否在夜间醒来。
These kinds of watches are used in sleep studies as a way of measuring how long people are sleeping, how efficient the sleep is, and whether they are waking up in the night.
日晷的对应物是水钟，用来测量夜间的时间。
The sundial's counterpart, the water clock, was designed to measure temporal hours at night.
夜间，一架飞行在3000英尺高空的飞机上安装了一个红外扫描仪，用来测量农作物散发的热量。
Mounted on a plane flying at 3,000 feet at night, an infrared scanner measured the heat emitted by crops.
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