Familiar smells can help to form memories in your sleeping brain, improving your performance at simple learning tasks.

相似的气味能帮助处于睡眠状态的大脑形成记忆，提高简单学习的效率。

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"It's not illegal to track your own employees inside your own building, " he says, adding that the data could be helpful in improving firm and worker performance.

WSJ: Tracking Sensors Invade the Workplace