Vaishnavi Chandrashekhar MUMBAI: In Mumbai, the number of 'unusually warm nights' in a year more than doubled from an average of 12 nights in 1981-2010 to 26 in 2011-2024, according to an analysis of IMD data by the Council on Energy, Environment and Water (CEEW). "Poor nighttime cooling disrupts sleep and recovery, especially for people doing physically demanding outdoor work," said CEEW fellow Vishwas Chitale.