在睡眠期间，血压和心率通常处于最低水平。
Blood pressure and heart rate are typically at their lowest levels during sleep.
研究人员说，这发生在第一次深度睡眠期间。
This was during the first deep sleep period, the researchers said.
其他呼吸调节机制显然在睡眠期间停止运行了。
Other respiratory regulating mechanisms apparently cease functioning during sleep.
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