https://mobile.abc.net.au/news/2019-01-18/hottest-night-on-record-noona/10725886
When it comes to heatwaves, the night-time temperature is important. If it stays above the mid-20s, overnight sleep can become difficult because the body needs to actively work to cool itself down.
Monash University climate scientist Stephanie Jacobs said the best strategy to help reduce night-time temperatures was to plant trees and vegetation and keep them watered.