When crayfish are kept continuously in the dark, even for four to five months, their compound eyes continue to adjust on a daily schedule for daytime and nighttime vision.

当小龙虾持续被关在黑暗的环境中，即使是4到5个月，它们的复眼仍然可以继续按照日常生活时间，对昼夜视觉进行调节。

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This feature can be used to tune database performance according to periodic changes in use, such as switching from daytime interactive use to nighttime batch work.

可以使用这个功能，根据使用过程中的周期变化(例如从白天的交互式使用转换到夜间的批处理工作)来调优数据库性能。

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Sleep only at night. Avoid daytime sleep if possible. Daytime naps steal hours from nighttime slumber. Limit daytime sleep to 20-minute, power naps.

只在夜间睡眠。尽可能避免白天睡觉。白天小睡会把夜间的熟睡时间偷走几个小时呢。把白天的睡觉时间限定为20分钟，权当一个恢复体力的小盹。

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Experts say heat waves often become dangerous when the nighttime temperature does not drop much from the highest daytime temperature.

VOA: special.2010.07.27

Sleep apnea may cause a person to be very drowsy in the daytime since nighttime sleep is interrupted frequently.

CNN: How can someone stop or reduce snoring?

The first carries compressed air, water, communications and a constant supply of electricity to power lights that are intended to simulate daytime and nighttime.

CNN: STORY HIGHLIGHTS

Work at Worldport is divided into two "sorts, " a daytime and nighttime window where packages are unloaded from arriving planes, rerouted to their next ride and sent off again.

ENGADGET: Inside UPS' Worldport: How a shipping titan moves 2,000 packages every 17 seconds