We would say that this whole area over which it migrates is its habitat because on this long-distance journey, it needs to come down to feed and sleep every so often, right?

我们会认为它迁徙的整个区域就是它的栖息地，因为在长途旅行中，它需要经常下来进食和睡觉，对吧？

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Learning by listening to information as we sleep has long been a mainstay of science fiction-and wishful thinking-but a new study suggests the idea may not be so farfetched.

长久以来人们认为在睡眠时收听资料来进行学习是天方夜谭，是痴心妄想，但是最新的一项研究发现这种方法也不一定是不可能的。

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University of California researcher Ying-Hui Fu said: 'My long-term goal is to someday learn enough so we can manipulate the sleep pathways without damaging our health.

加州大学研究员付英辉(音)说：“我的长期目标是今后做足研究，从而在不影响健康的情况下人为控制睡眠规律。”

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This can be tiring on a long journey, and also makes it difficult to snatch a few minutes sleep every so often.

BBC: Sport - Do horses get jet lag?