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Why do we usually sleep at night? What happens when we don’t sleep? Expert insights into this essential part of our lives

Sleep is an essential part of life. What happens when we don’t get enough sleep and how do we ensure that we do?
The graves of victims who died from cholera in Chingwele Cemetery in Lusaka. Zambia is one of the countries at the epicentre of a devastating outbreak in southern Africa. Luke Dray/Getty Images.

What’s behind the worldwide shortage of cholera vaccines? For starters, they’re only made by one company

The world’s stockpile of cholera vaccines has run dry, bad news for cholera-ravaged southern Africa. Why is this and what is being done to address vaccine shortages in Africa?