Well, we can ask a very different question: What is it about the physiological quality of your sleep when you do get it that restores and enhances your memory and learning ability each and every day?

好吧，我们可以问一个非常不同的问题：当你每天都能恢复和增强你的记忆力和学习能力时，你的睡眠的生理质量是什么？