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.
Kids need even more sleep than adults. 1  Teens need 8 to 10 hours of sleep each night. 2  School-aged children need 9 to 12 hours of sleep each night. 3  Preschoolers need to sleep between 10 and 13 hours a day (including naps).  Toddlers need to sleep between 11 and 14 hours a day (including naps).