They include the small town of Marree in northern South Australia which recorded two consecutive overnight minimum temperatures of 34 degrees early on Wednesday and yesterday. (Photo: Jason South/The Age) (The Age)These hot nights came after residents sweltered through daytime maximums above 48 degrees. On Monday night, the mercury in Adelaide refused to budge below 36 degrees at midnight. The ability for people to recover from hot days is impacted when they're followed by very warm nights. Keeping cool on a sticky nightNSW Health warns very warm nights accompanying daytime heatwaves are dangerous, as they prevent the body recovering from heat exposure.