然后再让他们在睡眠实验室中按照其喜欢的睡眠模式过两晚，期间每天让他们在功能核磁共振成像扫描仪中接受两次认知测试。

Then subjects spent two nights in a sleep lab, where they again followed their preferred sleep patterns and underwent cognitive testing twice daily while in a functional MRI scanner.

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他们的睡眠模式已经过测量，以确保缺乏休息不会影响测试结果。

Their sleep patterns were measured to make sure that lack of rest didn't distort the results.

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