Newborns sleep for 20-22 hours. February infant 18-20 hours, 15 hours, 2 years old 14 hours, 3-4 years old 13 hours, 5-7 years old 12 hours, 8- 12 years old/. 9 hours 7-8 hours for adults (not less than 6 hours) 60-70 years old 9 hours 70-90 years old 10 hour; More than 90 years old, not less than 10 hour.