According to a report by Climate Central, rising global temperatures driven by climate change are significantly disrupting sleep patterns. In India, which is one of the most affected countries, warmer nights are causing people to lose up to 90 hours of sleep annually. Southern states are experiencing the most severe impact.

According to a report by Climate Central, rising global temperatures driven by climate change are significantly disrupting sleep patterns. In India, which is one of the most affected countries, warmer nights are causing people to lose up to 90 hours of sleep annually. Southern states are experiencing the most severe impact. 
Climate Change’s Toll on Sleep
A recent global analysis revealed that during the 2020-2025 period, the average person lost around 56 hours of sleep annually due to high nighttime temperatures, with about 10% of this loss directly attributable to climate change. The human body naturally needs to drop its core temperature to achieve restful, deep sleep. However, the trapped heat prevents the body from cooling down, leading to frequent awakenings and reduced sleep quality. 
Impact Across Indian States and Cities
Southern India and densely populated urban areas are the worst hit by this phenomenon. People in the southern regions are losing between 78 and 91 hours of sleep each year.
 Specific regional and metro impacts include: -
Chennai: Residents are losing up to 93 hours of sleep annually. 
Tamil Nadu: -
Records the highest climate change-driven sleep loss (7.9 extra lost hours per person yearly). 
Mumbai and Kolkata:-
 Registered an average sleep loss of 84 hours and 80 hours per year, respectively. 
Delhi: 
Residents lose about 66 hours of sleep annually. 
Why It Is a Public Health Threat
Health experts warn that chronic sleep deprivation is more than just feeling tired; it poses severe, long-term health risks. Prolonged lack of quality sleep has been consistently linked to: 
Increased risk of cardiovascular diseases and high blood pressure.
Weakened immune systems and increased inflammation.
Higher vulnerability to type 2 diabetes and obesity.
Mental health conditions such as anxiety and depression. 
For a closer look at how urban design and trapped heat in cities are exacerbating these temperature changes and worsening nighttime conditions:
This heat isn't just climate change. It's how we built our cities. #heatwave .

MJF Lion ER YK Sharma 

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