How Much Sleep Is Enough? Sleep needs vary with age. A newborn may need as much as 14-17 hours spread throughout day, an infant may sleep 12-15 hours with most of sleep consolidated to the nocturnal sleep period, while toddlers may require 11-14 hours or more. Primary school going children should get 9-11 hours of sleep, while teenagers should get 8-10 hours. In adults, sleep requirement ranges from 7-9 hours. Although some people take pride in getting by with very little sleep, most people who get fewer than 5-6 hours of sleep are probably not getting enough sleep.