The relentless heatwave gripping our cities is more than just a daytime struggle; it's a 24-hour battle against soaring temperatures and the lack of respite during the night. The impact on our health and well-being is profound, and it's time we addressed this often-overlooked aspect of extreme weather.
On Wednesday, Melbourne reached a scorching 42 degrees, while Sydney's temperatures varied from 31 in the city to a sweltering 37 in the west, with humidity making it feel even hotter. Both cities are expected to maintain temperatures above 20 degrees well into the night, with minimal relief.
Senior meteorologist Dean Narramore highlights the challenge: "When temperatures don't drop at night, it becomes a serious issue. People need that cool-down period, and without it, the heat can be relentless."
The economic and health implications are significant. Ollie Jay, from the University of Sydney's Heat and Health Research Centre, notes that extreme heat costs the Australian economy over $6 billion annually in lost productivity. It also increases the risk of stillbirth and premature birth, triggers heart attacks, and impairs learning for schoolchildren.
While heat-related illnesses are more common during the day, hot nights bring their own set of problems. According to Jay, "The discomfort and sleeplessness caused by hot, humid nights can be just as detrimental to our health and well-being."
Dr. Harry Brown, part of a team studying sleep in heated chambers, adds, "Some people struggle to adapt to the heat, especially without a fan. The sweating can be intense, and without proper ventilation, it becomes a barrier to comfortable sleep."
Emma Bacon, Executive Director of Sweltering Cities, emphasizes the impact on vulnerable populations: "We hear from thousands of people struggling to sleep in extremely hot homes. The physical and mental health effects are significant, particularly for older adults, those with disabilities or chronic illnesses, and individuals managing mental health conditions."
Bacon describes the population-level impact: "During these hot weeks, you can sense the tension and exhaustion. People are grumpy, exhausted, and unwell, and it's largely due to the lack of sleep and the body's inability to recover."
So, what can be done to keep cool at night?
Jay recommends keeping windows and doors closed during the day to prevent the hotter outdoor air from entering the house. At night, when temperatures drop, opening windows can provide some relief.
Fans are a cost-effective solution, and Bacon suggests that even households with air conditioning can benefit from using fans to maintain a comfortable temperature and save on power bills.
Other tips include dampening the skin with wet or frozen towels or sarongs, and ensuring proper hydration by keeping water readily available.
However, Bacon highlights the challenges faced by renters: "While we can offer advice, the fundamental issue is the need for better renting and housing standards. People should be able to make improvements to their homes to ensure a good night's sleep."
The Insulation Council has been advocating for a national initiative to upgrade Australian homes with quality insulation, which would provide year-round benefits by keeping homes cool in summer and warm in winter.
While air conditioning is a popular solution during heatwaves, there are currently no concerns about grid capacity. The Australian Energy Market Operator has assured that extensive planning has gone into preparing the grid for summer demand, which typically peaks in February when industries and schools return full-time.
So, as we navigate these challenging heatwave nights, let's remember the importance of sleep and well-being, and work towards solutions that provide relief for all.
