Tropical nights (Tropennächte), when the temperature doesn’t fall below 20C, are becoming more common in Germany as the climate warms, and when they occur it can be hard to get a good night’s sleep. Heat makes sleep more difficult because the body naturally needs to cool down before it can drift off. READ ALSO: Can you get a rent reduction if your apartment gets too hot in Germany? People in Germany are struggling to sleep due to record-breaking hot nights. Dimming lights, closing shutters and reducing screen use before bed can all help your internal clock prepare for sleep.