India is experiencing a rise in very warm nights, especially in cities like Mumbai, Delhi, and Chennai. During heatwaves, night-time temperatures often remain significantly above normal, leaving little room for the body to recover. Prolonged exposure to heat can strain the cardiovascular system, cause dehydration, and lead to sleep deprivation. Studies have shown that poor sleep due to heat can result in increased fatigue, weakened immunity, and even higher risks of chronic illnesses like hypertension and diabetes.