Sleep is such a natural part of life and yet it remains largely unexplained by science. Leila Sattary finds out what dreams are made of and why sleep is so hard to understand.

Most people think they do not get enough of it. Dolphins do it half a brain at a time. Rats die after three weeks without it. Sleep is a common feature in the animal kingdom and yet it remains one of the greatest unsolved mysteries in science.

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