verb (used with or without object), bifurcated, bifurcating. 1. to divide or fork into two branches. adjective. 2. divided into two branches.
Advertisement. By the Numbers. According to the National Sleep Foundation, newborns should sleep 12 to 18 hours out of every 24 (every new parent hopes), with a gradual reduction to 12 to 14 hours for toddlers ages 1 to 3; 11 to 13 hours for preschoolers 3 to 5; and (yes!) 10 to 11 hours for schoolchildren ages 5 to 10.
For about a decade, the paediatric sleep community has recommended that children three to five years old need 11 to 13 hours, children five to 10 years old need 10 to 11 hours, and adolescents 10 to 17 years need eight-and-a-half to nine-and-a-half hours of sleep each night.