Hot nights can significantly disrupt sleep, leading to a range of health issues, including cardiovascular strain, dehydration, and impaired cognitive and emotional recovery. Vulnerable populations, such as older adults and those with pre-existing health conditions, are at higher risk. In Hong Kong, for example, prolonged nighttime temperatures of around 30°C (86°F) have been associated with a 3.1% increase in emergency hospital admissions, rising to 5.3% among older and economically disadvantaged individuals. The cumulative effects of sleep disruption can lead to long-term health consequences, including increased mortality rates during heatwaves.