- People who go to bed early even when they don’t have to wake up early
- People who go to bed early only when they have to wake up early
- People who go to bed late even when they have to wake up early
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怎么没有躺床上玩手机玩到 4 点失眠发现第二天有早八
数学系的同学作息都这么规律的吗