Here's the lowdown on how much sleep kids need at different ages, according to a consensus group of 13 sleep medicine experts and researchers who developed the recommendations: Infants 4 to 12 months - 12 to 16 hours of sleep every 24 hours (including naps). Children 1 to 2 years - 11 to 14 hours of sleep every 24 hours (including naps). Children 3 to 5 years - 10 to 13 hours of sleep every 24 hours (including naps). Children 6 to 12 years - 9 to 12 hours of sleep every 24 hours.