Dreams take up about one quarter of our sleeping time.
做梦大约占我们睡眠时间的四分之一。
Researchers also think there might be an "optimal sleeping time" to stay healthy.
研究者也认为也许有个“最佳的睡眠时间”可以保持健康。
Does your biologic time change in the space? How to set up your sleeping time?
你的生物钟在太空会发生变化吗？如何安排睡眠时间？
You see holidays only as extra sleeping time.
放假你只当是额外的睡觉时间。
You see holidays only as extra sleeping time.
放假你只当是额外的睡觉时间。
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