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.
School-Age Kids and Preteens. School-age kids need 10 to 11 hours of sleep a night. Bedtime problems can start at this age for a variety of reasons. Homework, sports and after-school activities, computers, TVs, mobile devices, and hectic family schedules all can contribute to kids not getting the sleep they need.