Newborns (0-3 months): 14-17 hours per day, in short naps and longer stretches.
Infants (4-11 months): 12-15 hours per day, including naps.
Toddlers (1-2 years): 11-14 hours per day, including naps.
Preschoolers (3-5 years): 10-13 hours per day, including naps.
School-age children (6-13 years): 9-11 hours per day.
Teenagers (14-17 years): 8-10 hours per day.
Young adults (18-25 years): 7-9 hours per day.
Adults (26-64 years): 7-9 hours per day.