JAKARTA - The average world population loses almost 56 hours of sleep per year which is associated with high night temperatures. Climate Central's analysis says the proportion of sleep loss associated with climate change continues to increase.
Euronews quoted Thursday, July 16, saying the findings came from an analysis of more than 1,300 cities over the period 2020 to 2025. The lost sleep is equivalent to almost seven nights a year.
Tropical nights or hot nights occur when the temperature does not drop below 20 degrees Celsius throughout the night. This condition is increasingly common in various regions.
In almost all of the cities analyzed, the loss of sleep time due to high temperatures related to climate change has at least doubled compared to the early 1970s.
The highest impact was recorded in the Middle East and Southeast Asia. Residents in both regions lose an average of 55 to 91 hours of sleep per year.
In the early 1970s, residents in cities with an average population of 500,000 lost about 46 hours of sleep per year due to heat at night. The figure rose to about 50 hours in the 2020s.
Between 2020 and 2025, the loss of sleep time increased to almost 56 hours per year.
The impact is not the same in every region. In Europe, the largest loss of sleep was recorded in the south.
Residents of Naples, Italy, have lost an average of 51 hours of sleep per year due to heat over the past five years. Athens recorded 45 hours, Valencia 42 hours, while Lisbon and Marseille each had 40 hours.
Cities in northern Europe are also affected, although more lightly. Edinburgh residents lose 21 hours of sleep per year. Stockholm and Helsinki each recorded 20 hours, while Oslo recorded 18 hours.
The evening should be a time for the body to recover. When the temperature does not drop, the body's recovery process can be disrupted and the body remains under pressure.
The study's authors say lack of sleep is linked to mood changes, reduced thinking and productivity, and heart and immune system disorders.
Cities also face additional risks due to the heat island effect. This condition makes urban temperatures remain higher than surrounding areas, including at night.
Sleep loss can accumulate from night to night. A small-looking reduction in sleep time can become a problem during the summer.
Euronews also quoted a recent study that found warmer nights affected the sleep of people over 65 more than twice as much as the middle-aged group.
The impact is almost three times greater in low- and middle-income countries than in high-income countries.
Women and residents living in hot climates are also more affected. The gap is expected to widen if temperatures continue to rise.
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