Tropical nights are becoming more common across Germany as the climate warms. A few surprisingly effective tricks, from mastering 'Querlüften' to sleeping under an empty duvet cover, can help you stay cool and get some rest.

Tropical nights are becoming more common across Germany as the climate warms. A few surprisingly effective tricks, from mastering 'Querlüften' to sleeping under an empty duvet…

In much of Germany, night time temperatures had only finally dipped below 20C on Thursday night. But another heatwave is set to move in over most of the country.