Previous studies have linked sleep problems with such repetitive negative thoughts, especially in cases where someone does not get enough shut eye. Nota and Coles set out to replicate these studies, and to further see if there's any link between having such repetitive thoughts and the actual time when someone goes to bed.

早期研究表明睡眠质量和不断出现的消极情绪有一定关系，特别是在没有获得充足睡眠的情况下。Nota和Coles对这些实验做了重复性的研究，并且进一步研究了产生消极情绪和睡眠的确切时间是否有一定联系。

They asked 100 young adults at Binghamton University to complete a battery of questionnaires and two computerized tasks. In the process, it was measured how much the students worry, ruminate or obsess about something -- three measures by which repetitive negative thinking is gauged. The students were also asked whether they were more habitual morning or evening types, preferring to hold regular hours or to have a sleep-wake schedule that is more skewed towards later in the day,

Nota和Coles要求一百位在宾汉姆顿大学的成年人完成一份调查问卷和两个电脑测试。在此过程中，测量了学生们到底有多担心，忧虑或者困扰于某些事情——这是三种主要的反复出现的消极情绪。参与实验的学生被问了一些问题，像更习惯早起还是熬夜，是会倾向于坚持一个正常的作息时间还是会有一个睡眠的时间安排表——但是不一定遵守。

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