Lifestyles and preventive practices. Absolute figures Average number of hours of sleep, by sex and social class of the main breadwinner. Average and standard deviation. Population aged 0 years old and over Units: average and standard deviation ,Average,Standard deviation, BOTH SEXES, Total,7.77,2.39, I: Executives of Public Administrations and of companies with 10 or more employees, and professions associated with university degrees,7.81,2.19, II: Executives of companies with fewer than 10 employees, and professions associated with intermediate degrees. Advanced technicians. Artists and sportspersons,7.76,1.87, III: Administrative type employees and Administrative and financial support professionals. Personal services and Security workers. Freelance workers. Supervisors of manual workers,7.74,2.36, IVa: Skilled manual workers,7.79,2.68, IVb: Semi-skilled manual workers,7.78,2.25, V: Unskilled workers,7.79,2.48, No data recorded,7.49,1.69, MALES, Total,7.84,2.55, I: Executives of Public Administrations and of companies with 10 or more employees, and professions associated with university degrees,7.72,2.36, II: Executives of companies with fewer than 10 employees, and professions associated with intermediate degrees. Advanced technicians. Artists and sportspersons,7.72,1.80, III: Administrative type employees and Administrative and financial support professionals. Personal services and Security workers. Freelance workers. Supervisors of manual workers,7.83,2.77, IVa: Skilled manual workers,7.90,2.79, IVb: Semi-skilled manual workers,7.89,2.36, V: Unskilled workers,7.94,2.48, No data recorded,7.49,1.57, FEMALES, Total,7.70,2.21, I: Executives of Public Administrations and of companies with 10 or more employees, and professions associated with university degrees,7.91,1.98, II: Executives of companies with fewer than 10 employees, and professions associated with intermediate degrees. Advanced technicians. Artists and sportspersons,7.80,1.94, III: Administrative type employees and Administrative and financial support professionals. Personal services and Security workers. Freelance workers. Supervisors of manual workers,7.66,1.86, IVa: Skilled manual workers,7.68,2.55, IVb: Semi-skilled manual workers,7.68,2.16, V: Unskilled workers,7.66,2.47, No data recorded,7.49,1.76, Notes: 1) Includes hours of rest time The symbol '.' shall be deemed as data which cannot be provided since it may be affected by sampling errors. The symbol '..' shall be deemed as data which is not collected. The symbol '...' shall be deemed as an 'error of division by zero'. Source: Ministry of Health and Consumption and INE