As climate change continues to escalate, its far-reaching impacts are becoming alarmingly evident. A recent study reveals that rising nighttime temperatures are costing individuals almost a week of sleep each year. This significant loss—averaging nearly 56 hours annually—has serious implications for health and wellbeing across the globe.
A Comprehensive Analysis
Conducted by the US-based climate science organisation Climate Central, the analysis scrutinised data from 1,338 cities worldwide, covering the period from 2020 to 2025. The findings indicate that, on average, people are losing about 56 hours of sleep yearly due to elevated nighttime temperatures, with over six hours of this loss directly attributable to climate change itself. Notably, the research claims to be the first of its kind to quantify sleep deprivation associated with climate change by examining how temperature influences sleep patterns.
The report states, “Climate change and nighttime warming are increasingly impinging on the ability to get a good night’s sleep.” Alarmingly, the portion of sleep loss linked to climate change has more than doubled since the early 1970s in nearly all cities surveyed, with a tripling effect observed in over 840 of them.
Regional Disparities in Sleep Loss
The data highlights stark regional variations in sleep deprivation. In the Middle East, countries like Saudi Arabia, Oman, and the United Arab Emirates face some of the most severe impacts, with residents losing between 55 and 87 hours of sleep each year, approximately 12 to 16 of which are due to climate change—equating to nearly two full sleepless nights annually.
Meanwhile, individuals in southern India and parts of Southeast Asia report even greater losses, ranging from 78 to 91 hours annually, with eight to nine hours linked to climate change. In West Africa, countries like Niger, Nigeria, and Burkina Faso also experience significant sleep deprivation, with residents losing 65 hours or more each year, around 10 to 11 of which are due to environmental changes.
In the United States, the analysis covered 253 cities, revealing an average sleep loss of 36 hours per year from increased nighttime temperatures, with climate change accounting for about four of those hours. Cities in Arizona, California, Florida, and Nevada were among the hardest hit. Alarmingly, the climate-related loss of sleep in US cities has tripled since the early 1970s, when it was just over one hour annually.
Health Implications of Sleep Deprivation
The ramifications of losing sleep extend far beyond mere fatigue. Researchers have linked inadequate sleep to a range of health issues, including poorer mood, diminished cognitive function, decreased productivity, and adverse effects on cardiovascular and immune health. As the analysis points out, “Because many people already get insufficient sleep and sleep loss can accumulate over repeated nights, even modest reductions can become harmful over the course of a hot season.”
Certain demographics are disproportionately affected. The report indicates that older adults, particularly those aged 65 and above, experience sleep loss from warmer temperatures that is more than twice that of middle-aged individuals. Furthermore, those living in lower-middle-income countries face nearly three times the risk compared to their counterparts in wealthier nations. Women and people in hotter climates are also at greater risk, suggesting that as temperatures rise, the already vulnerable will suffer even more.
The Inequity of Cooling Solutions
While air conditioning can mitigate the effects of heat on sleep, it does not completely eliminate the problem. The study highlights stark inequalities in access to cooling technologies, with only around 35 per cent of households globally having air conditioning as of 2021. Access is often tied to income, leaving many in hot regions, including parts of South Asia and Africa, without relief. Even in wealthier areas where cooling is more common, warmer nights continue to disrupt sleep patterns.
The research utilised observed daily minimum temperatures alongside estimates of what those temperatures would have been without human-induced climate change, covering a period from 2020 to 2025 and drawing comparisons to historical data from the early 1970s.
Why it Matters
The increasing temperatures and subsequent sleep deprivation are not merely statistics; they reflect a growing public health crisis exacerbated by climate change. This loss of sleep can lead to serious health consequences over time, affecting productivity, mental health, and overall quality of life. As climate-related challenges intensify, it is imperative that we address the broader implications of sleep loss and work towards solutions that not only mitigate climate change but also ensure public health and wellbeing in the face of these alarming trends.