Hotter Nights Cut Sleep Worldwide

Rising nighttime temperatures are reducing sleep worldwide, with Climate Central estimating nearly 56 hours of annual sleep loss per person across more than 1,300 cities during 2020–2025.

About six hours of that loss was attributed to human-caused climate change, with larger impacts in parts of the Middle East and among populations more exposed or less able to access cooling. The findings connect hotter nights with broader health concerns and point to housing conditions, energy access, and bedroom temperatures as important factors for adaptation and risk assessment.