名词
中文翻译：睡眠周期
同义词：
['sleep cycle', "sleep rhythm例句：1. The hypnic waves are the natural rhythm of our body's sleep cycle.（睡眠节律是人体自然的节奏。）2. During the hypnic phase", 'the brain is preparing for sleep.（在催眠阶段，大脑正在为睡眠做准备。）']
例句：
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1. The hypnic waves are the natural rhythm of our body's sleep cycle.
睡眠节律是人体自然的节奏。
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2. During the hypnic phase, the brain is preparing for sleep.
在催眠阶段，大脑正在为睡眠做准备。
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3.The hypnic state is a crucial part of the sleep cycle.
催眠状态是睡眠周期中至关重要的一部分。