Unlike mammals, they only need their hypocretin system to regulate sleep at night.

与哺乳类不同，它们的增食欲素系统只需要在夜间管理睡眠。

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Unlike mammals, they only need their hypocretin system to regulate sleep at night.

与哺乳类不同，它们的增食欲素系统只需要在夜间管理睡眠。

youdao