Many studies say that ideal human sleep time must be adjusted for age.

In babies born until 11 months old, it takes 12-18 hours to sleep. Toddlers aged 1 to 5 years need 11-14 hours. Children up to 6-17 years old need 8-11 hours, and adults aged 18-64 years (or more) who need 7-9 hours to sleep. These studies were carried out throughout 2004 to 2014.

According to LiveScience.com, recently (precisely February 2, 2015) an organization called The National Sleep Foundation claims that they have found a new method of sleep that is ideal for humans. This non-profit organization based in the United States says this new method further broadens the age category, especially the adult age category. Also, with sleep times that tend to be shortened.

This recommendation is based on 300 studies on sleep and refers to the health aspects that humans will get if they experience sleep deprivation or even too much sleep. Following are the recommended research results:

Newborns (up to 3 months old): 14 to 17 hours a day (previously 12 to 18 hours)

Infants (ages 4 to 11 months): 12 to 15 hours a day (previously 14 to 15 hours)

Toddlers (ages 1 to 2 years): 11 to 14 hours a day (previously 12 to 14 hours)

Toddlers (ages 3 to 5 years): 10 to 13 hours a day (previously 11 to 13 hours)

Children (ages 6 to 13 years): 9 to 11 hours (previously 10 to 11 hours)

Adolescents (ages 14 to 17 years): 8 to 10 hours (previously 8.5 to 9.5 hours)

Adults (aged 18 to 25 years): 7 to 9 hours (new age category)

Adults (ages 26-64 years): 7 to 9 hours (same recommendation as before)

Seniors (age 65 or older): 7 to 8 hours (new age category)

It can be seen from the results of this latest study that the adult age category which was initially only one category is now separated into three, namely vulnerable adults (Younger adults) aged 18-25 years, vulnerable middle-aged adults (Adults) aged 26-64 years and older adults (adults) with a vulnerable age of 65 or older. Likewise, sleep time changes that change in almost all age categories, where some are reduced and partially added.