For humans, including babies, light signals the time to awake and long, restful sleep occurs in the dark.

对人类来说，包括宝宝，光会刺激大脑，提示是醒来的时间了，而优质睡眠通常都发生在黑天的时候。

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For humans, including babies, light signals the time to awake and long, restful sleep occurs in the dark.

对人类来说，包括宝宝，光会刺激大脑，提示是醒来的时间了，而优质睡眠通常都发生在黑天的时候。

youdao