Leaving the air conditioner (AC) on overnight can pose health risks, including respiratory problems, dehydration, and hypothermia. Cold, dry air can irritate the airways, exacerbate asthma, or cause throat dryness. In a recent fatality case, prolonged exposure to extreme cold in a closed environment reportedly led to death. To reduce risks, ensure proper ventilation, maintain moderate temperatures, and use a humidifier to counteract the dryness while sleeping with the AC on.
