From artificial lights, to late night TV, and now the ever-present glow of our smartphones, modern life is often blamed for ruining our sleep. But do we really need so much sleep? Neil and Alice discuss a new study by American researchers which has concluded that our ancestors were probably as sleep deprived as we are.
http://www.bbc.co.uk/learningenglish/english/features/6-minute-english/ep-160114
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