According to the Mayo Clinic, the recommended sleep hours are as follows: Infants need 9 to 10 hours plus daily naps of 3 hours or more. Toddlers need 9 to 10 hours plus up to 3 hours of naps per day. School-aged children need 9 to 11 hours each night. Teens need 8.5 to 9.25 hours per night. Adults need 7.5 to 8 hours per night.