When we experience extreme emotions it can put us off balance and lead to some unintended behavior and consequences.

极端的情绪会使我们内心失去平衡并且导致一些无意识的行为和结果。

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According to US lead author Jessica Payne, a psychologist at the University of Notre Dame in Indiana, nodding off after learning something new is like 'telling' the sleeping brain what to retain.

该研究的主要作者、美国印第安纳州诺特丹大学的心理学家杰西卡·佩恩认为，在学完新东西后打个盹就像把要记住的东西“告诉”睡眠中的大脑。

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Okay, Ben Feller from the Associated Press will lead us off with questions.

WHITEHOUSE: Press Briefing

It also can lead to us taking time off to recharge after a stressful situation has passed.

FORBES: Leaders' Emotional Rollercoasters

That a minority of Republicans continue to block any compromise and oppose tax rises of any kind may yet lead to the US walking off the fiscal cliff.

BBC: Can Washington learn from Californian budget compromise?