Climate change is affecting Guwahati residents in a unique way - by stealing their sleep. A new analysis by Climate Central has found that residents of Guwahati lose an average of 72 hours of sleep every year due to high nighttime temperatures, with six of those hours directly attributable to climate change.
This trend is part of a larger global phenomenon, where warmer nights driven by climate change are increasingly disrupting sleep across 107 Indian cities. India has emerged as one of the global hotspots for climate-related sleep loss, with severe health impacts. The science is clear that sleep is essential for our health, and climate change is eroding sleep by pushing up nighttime temperatures.
For Guwahati, the trend is unmistakable. Between 1970 and 1975, residents lost an average of 65 hours of sleep annually due to heat, with only three hours linked to climate change, accounting for about 4% of the total. By 2020-2025, total annual sleep loss had risen to 72 hours, while the portion attributable to climate change had doubled to six hours, representing 9% of all temperature-related sleep loss.
The findings place Guwahati within a broader national trend that identifies India as one of the world’s hotspots for climate-related sleep disruption. Major metros such as Chennai, Mumbai, and Kolkata reported the highest overall sleep losses, while Bengaluru showed one of the strongest climate change signals, with eight hours of sleep lost annually due to human-caused warming.
Scientists warn that the findings have important public health implications. Sleep deprivation caused by warmer nights has been linked to cardiovascular disease, weakened immunity, poorer mental health, reduced cognitive performance, and lower workplace productivity. As Northeast India experiences more frequent heatwaves and warmer nights, experts say the erosion of sleep quality could become an increasingly significant public health challenge, adding another dimension to the region’s vulnerability to climate change.
Globally, the average person lost nearly 56 hours of sleep each year because of high ambient temperatures during 2020-2025, with more than 10% of that loss directly attributable to climate change, according to the report. While Guwahati’s climate change-linked sleep loss remains lower than that of India’s hottest cities, researchers say the increase highlights an emerging and often overlooked consequence of global warming.
