The nights in metropolitan areas are losing their value as cool-down spaces. The rise in temperature during the night is evident across urban areas such as Delhi, Mumbai, and Hyderabad, hot nights in Indian cities sleep problems. however, this has increased significantly during extreme heat events.
The shift in how we experience cool down periods at night can be attributed to two factors: (1) Urban Heat Island Effect – areas made up of concrete and asphalt act like a heat sink or an area that absorbs heat during the day and slowly releases that heat back into the surrounding area after sunset; and (2) increased humidity levels (in coastal areas specifically) reduce the rate of evaporation which reduces the ability of the body to cool itself. The result is warm and sticky nights with little relief from the daytime heat.
Why It’s Affecting Your Sleep (and Health)
In order for an individual to get enough rest, there needs to be a slight reduction in their body temperature. When the temperature in a room stays elevated, this reduction does not occur easily and can result in difficulty falling asleep, too frequent awakenings, and reduced sleep quality.
In addition to the sleep disruption, there are also negative physiological effects from having continuous exposure to warm air for longer than one night – the increased workload on the heart, an increase in the risk of dehydration, and reduced recovery from daytime heat. When multiple nights of inadequate sleep occur, this can result in accrued fatigue, irritability, and decreased concentration, which can lead to an increased risk of heat-related illnesses such as heat stroke.
What You Can Do Tonight (Practical Fixes That Work)
Start with airflow. Airflow (cross-ventilation, i.e., open opposite windows and/or doors) and a fan create a continuous flow of heat away from you. To maximise the cooling benefit of using AC, set the thermostat between 24 and 26 degrees Celsius and use a fan to improve air circulation.
Pre-cooling your bedroom when you go to sleep requires that you close drapes or window coverings during the day; use reflective shades on your windows; and turn off heat-generating appliances prior to using the room for sleeping. You will want to use bedding that is light in weight and capable of breathing (i.e., made from cotton or linen) and avoid heavy mattresses that trap heat.
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Final Words
It seems that hot nights have become the new normal in most urban areas of India. Not only do we have a problem with heat during the day, but also find it difficult to recover from the heat of daytime after dark. Although you cannot change the weather, you can change how you can best maximise your sleeping comfort using your room’s characteristics; therefore, it is important to focus on airflow by making use of light-weight materials and designing for efficient cooling. In other words, today’s changing climate requires us to create a conducive sleep environment.
FAQs
1. Why do cities feel hotter at night than nearby areas?
Because built surfaces release stored heat slowly, keeping urban areas warmer after sunset.
2. Is humidity a big factor?
Yes. High humidity reduces sweat evaporation, making nights feel hotter and more uncomfortable.
3. What’s the best room temperature for sleep in summer?
Around 24–26°C with good airflow for most people.
4. Can poor sleep during heatwaves affect health?
Yes. It can cause fatigue, stress, and increase vulnerability to heat-related illnesses.
