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In the morning, we start off feeling fresh and rested (ideally, at least). As the day wears on, sustained cognitive engagement depletes our mental resources, and our behavior changes for the worse. 早晨，我们觉得既清爽又精力充沛（至少理想中是这样）。随着时间流逝，持续的认知投入使我们的精神资源衰竭，而我们的举止也每况愈下。 Every day we make decisions that have important implications for our happiness and how we live our lives. Whether we are studying for an exam, preparing for a job interview, or deciding on the best outfit for a first blind date, these very different situations have something in common: They happen at a certain time of day, a time we often can choose or control. 每一天我们会做出对我们的幸福有着重要影响的决定并决定如何生活。不论我们是为了一次考试而学习、为了一次求职面试而做准备或是为了初次约会而决定好好打扮，这些非常特殊的情况有一些共同之处：他们发生在一天中的某一时刻里，而那个时刻经常是我们可以选择或控制的。 | 
