Sleep needs are largely individual — some people can thrive with less sleep than others. However, different age groups generally require different amounts of sleep. Babies need up to 18 hours of sleep each day, while most adults require 7 to 9 hours. However, the
2011 Sleep in America
poll conducted by the National Sleep Foundation revealed that 63 percent of adult Americans sleep less than 7 hours a night, and 15 percent sleep less than 6 hours on weeknights.