September 2, 2013 | David

I often lie in bed for hours with my mind wandering all over the place, wishing I could go to sleep. Other people nod off instantly. Why?

Scientists have reported that poor sleepers find it hard to suppress irrelevant brain activity while they're doing a focused memory task. But the study isn't able to answer the question I have: are they unable to focus because they sleep badly, or do they sleep badly because they're unable to focus?

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An image of a man sleeping on a train

Our scientific understanding of sleep is still very limited.

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Image: Flickr/incendiarymind

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