Human beings spend on average one third of their lives asleep. We know we need to sleep but most of us have never really given a whole lot of thought to why.
Why do we spend seven or eight hours a night immobile and unconscious? What really happens inside our brains and bodies while we're sleeping?
We've known the purpose of our other biological drives for hundreds of years: we eat to give our bodies energy, we drink to keep hydrated, we procreate to perpetuate the species - among other things. But what is the biological purpose of sleep?
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"I don't know about all the science, but I know THIS - naps are awesome!"
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