根据一项关于睡觉的鸭子的新研究来看，半睡半醒的鸟儿——大脑的一个半球处于警觉状态，另一个半球处于睡眠状态——控制着大脑的哪一边保持清醒。
Birds that are literally half asleep—with one brain hemisphere alert and the other sleeping—control which side of the brain remains awake, according to a new study of sleeping ducks.
十个人中大约只有两个人处于最佳警觉状态。
上边完成后，从5倒数到1，让自己回到警觉状态。
When you are finished, return to alertness by counting backwards from 5 to 1.
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