虽然有规律的锻炼很重要，但是在睡前锻炼绝对不是一个好主意。

Although regular exercise is very important, it's never a good idea to exercise too close to bedtime.

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解说： 又大又美丽的螺旋星系 M101 是查理斯·梅西尔著名的星系目录中的最后一条，但绝对不是最不重要的。

Explanation: Big, beautiful spiral galaxy M101 is one of the last entries in Charles Messier's famous catalog, but definitely not one of the least.

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格茹博说，尽管REM普遍被认为是睡眠的做梦阶段，这个睡眠阶段为何重要的原因尚不是绝对清楚。

While REM is popularly thought of as the dream stage of sleep, it's not absolutely clear why this sleep stage is important, Dr. Gruber notes.

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