在考试期间，你想让你的大脑处于最佳工作状态，所以在睡觉前安排放松时间，避免深夜复习，尽量早点睡觉，这样你就能得到足够的睡眠。
During your exam period, you want your brain to work at its very best, so build in relaxation time before bed, avoid late night revision sessions and try to go to bed early so you get enough sleep.
研究者也认为也许有个“最佳的睡眠时间”可以保持健康。
Researchers also think there might be an "optimal sleeping time" to stay healthy.
以前我告诉过你们为什么10小时的睡眠时间被认为是最佳的。
I told you how 10 hours of sleep is what find optimal in the last post.
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