Experts recommend that adults sleep between 7 and 9 hours a night.
Adults who sleep less than 7 hours a night may have more health issues than those who sleep 7 or more hours a night. Sleeping more than 9 hours a night is not necessarily harmful and may be helpful for young adults, people who are recovering from sleep deprivation, and people who are sick.
How much sleep children should get depends on their age. Sleep experts consider naps to be appropriate for children under age 7.