问题描述：
Since they only sleep in/at/for/during a little bit at a time,
the term "light sleeping" is used to describe their (behaviour/heart/body/habits).
选择并翻译,最好说明为什么
the term "light sleeping" is used to describe their (behaviour/heart/body/habits).
选择并翻译,最好说明为什么
问题解答：
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