One recent study shows that the sleep-deprived brain toggles between normal activity and complete lapses, or failures, a dangerous state of slowed responses and foggy inattention.

• 一项最近的研究表明，睡眠缺乏的大脑，要么会正常活动，要么完全失效，这是一个危险阶段：反应慢并且注意力涣散。