在经过锻炼之后，常见的症状是会保持清醒和警觉，因此如果在晚上你已经有睡眠困难，那么在晚上锻炼是不明智的。
It's common to feel too awake and alert after a good workout, so it would not be wise to workout at night if you already have trouble sleeping.
对于精细复杂的人脑来说，需要持续保持警觉的任务常常令大脑感到疲劳和无聊，因此人类并非生而善于此类工作，这是显而易见的。
The blunt truth of the matter is that human beings are not designed for tasks which require relentless vigilance: for the sophisticated human brain these are fatiguing and boring.
因此，大脑和心灵必须安静，在艰辛之后保持警觉的被动，以便更新自己。
So must the mind-heart be silent, alertly passive after travail, to renew itself.
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