Our reporter meets various people who work nights to see what they do and to ask how they feel about it. The price can be high in terms of health and well-being. Yet some night workers just love it.
Germany's weather service has reported the highest temperature on record. At least 12 have drowned in accidents, as people sought to escape one of the worst heat waves to hit central Europe in years.
More than 1,100 people have already died of dehydration in Pakistan's scorching temperatures. The risk is made worse because devout Muslims don't eat or drink anything between sunrise and sunset during Ramadan.
Hospital workers in Cameroon have gone on strike in protest at 'unbearable' working conditions. Their demands include state-of-the art medical equipment, more drugs to treat patients and action against corruption.
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