Adequate sleep is crucial for a child's physical and mental development. Infants typically need 14-17 hours of sleep, while toddlers require 11-14 hours. Preschoolers should get about 10-13 hours, and school-aged children need 9-12 hours. Adolescents should aim for 8-10 hours of sleep each night. Establishing a consistent bedtime routine can help ensure they get enough rest.