Their sleep/wake cycle lengthened suggesting the brain mechanism that controls the timing of activity and rest had been affected.
它们的作息周期变长，表明控制作息时间的大脑机能受到影响。
Sleep is part of a person's daily activity cycle. There are several different stages of sleep, and they too occur in cycles.
睡眠是人每天日常活动循环的一部分。人的睡眠分几个阶段，而这些阶段也是循环发生的。
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