Why 25°C Nights Are More Dangerous Than 40°C Days – The Hidden Health Risk of Urban Heat Islands
It’s common for people to associate heatwaves with extreme heat during the day; however, there is another aspect of heatwaves that is more dangerous than people realize, which are warm nights that still remain above 25°C. According to experts in public health and medicine, warm nighttime temperatures do not allow the body to fully recover from the day’s heat stress.
Here are the top four reasons why sleeping in warm rooms can be dangerous:
Why Warm Nights Are a Health Risk
1. Your Body Cannot Cool Down
Typically, at the end of each long, hot summer day your body can use the cooler nighttime temperatures to help you recover from your long hot day. When nighttime temperatures remain above 25°C there is no way for you to cool down or allow your body to recover from the heat stress from the previous day.
2. Poor Sleep Quality
Warm rooms at bedtime can result in a person either having difficulty falling asleep or having difficulty remaining asleep throughout the night. Poor quality sleep can lead to feelings of fatigue, impair judgement, and negatively affect overall health.
3. Increased Risk for Vulnerable Groups
Seniors, infants, pregnant women, and people with heart or lung disorders comprise a vulnerable population who, when subjected to prolonged heat, will very likely suffer from heat-related illnesses because of the additional heat stress placed on their bodies during long periods of time.
4. Higher Risk of Heat-Related Illness
If an individual is subjected to prolonged excessive temperatures during the day and the night, the likelihood that an individual will experience heat-related illnesses including dehydration, heat exhaustion, and, in extreme cases, heat stroke greatly increases.
Conclusion
Although a warm day might be uncomfortable, the hours of darkness are often more hazardous as the body doesn’t have the chance to recover from being too hot. As urban heat islands continue to appear, it is essential to consider heat during the night as much as heat during the day.
FAQs
What is an Urban Heat Island?
An urban heat island is created when buildings and pavement absorb and retain heat; therefore, as a result, the city is warmer than the adjacent countryside.
What are the dangers of warm nights?
A body that does not receive enough time to cool itself off has a greater chance of suffering from heat-related illnesses.
Who are those who suffer greatest risk?
The most at risk are the elderly, infants, people with chronic health problems, and people without any means of cooling.
What is a tropical night?
A tropical night occurs when the overnight low temperature is greater than 20°C and therefore results in a loss of cooling for the body during the night.
