Our imaginations give it to the heart while we are asleep.

当我们在睡梦中，我们把想象力赐予了内心。

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But it flutters down, soundless, hour after hour while we are asleep.

但是，雪飘然而下，悄悄地，一小时又一小时，而我们是睡着的。

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In 2007 one of us (Ellenbogen) showed that the brain learns while we are asleep.

2007年，我们中的一人(Ellenbogen)展示了大脑在睡眠的时候还在学习。

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The Arctic sea ice is constantly moving, breaking open and reforming into different shapes - which means we can end up moving several kilometres in any direction while we are asleep in our tents.

BBC: Arctic diary: Explorers' ice quest