Charles Czeisler, a professor at Harvard University, together with a team of experts, conducted a research, including of many studies from 2004 to 2014, in order to find out the needed sleep hours, and the effects of sleep on the health.
According to the different development stages, they made the following conclusions:
- Newborn (0 to 3 months): 14 to 17 hours.
- Babies (4 to 11 months): 12 to 15 hours.
- Children (1-2 years): 11 to 14 hours.
- Preschool (3-5 years): 10 to 13 hours.
- School Age (6-13 years): 9 to 11 hours.
- Teens (14 to 17): 8 to 10 hours.
- Youth (18-25 years): 7 to 9 hours.
- Adults (26-64 years): 7 to 9 hours.
- Seniors (over 65 years): 7 to 8 hours.
Each individual needs different hours of rest, so these guidelines are approximate.
Sleepy Baby (ca.1910) painting in high resolution by Mary Cassatt. Original from the Dallas Museum of Art.
The Briar Rose Series – Study for ‘The Garden Court’ (1889) painting in high resolution by Sir Edward Burne–Jones
The Briar Rose Series
With the Wind from The Flower Book (1905) by Sir Edward Burne–Jones