You look tired. You are in need of sleep.

你看起来很累，你需要睡眠。

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Each kind of mammals, birds and most reptiles, amphibians animals and fish are in need of sleep to maintain normal life activities.

每一种哺乳动物、鸟类和大多数爬行动物、两栖类动物和鱼类都需要睡眠来维持正常的生命活动。

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Of those, about 25 percent who said they felt fine were actually so in need of sleep that they posed a danger to themselves or others.

这些人中，说自己感觉良好的人约有25%其实非常需要睡眠，以致他们对自己或他人构成了威胁。

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The massive grass-roots efforts that ushered Obama into office have seemingly gone back to sleep and are in desperate need of being reawakened.

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While this may be partially due to injury, illness, or other complications of aging, some research suggests that older adults need less sleep in general.

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