Multiple sources report that nights in Indian cities are warming faster than daytime temperatures, driven largely by urban surfaces such as concrete that store and release heat after sunset. As a result, residents experience higher nighttime “heat stress” even when air-conditioning is available, because the surrounding built environment remains hot and the body’s ability to cool and recover during sleep is reduced. The coverage links these conditions to sleep disruption and broader public health risks, including worsening or contributing to conditions such as hypertension and diabetes. Experts cited emphasize that vulnerable groups—including people with existing health problems, older adults, and those with limited access to cooling—are more affected by sustained high temperatures at night. The sources call for night-time warming to be treated as a public health issue rather than only a weather concern, and they argue for urgent steps in urban planning and infrastructure to reduce heat retention and improve cooling and resilience in densely built areas.