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In 2015 , a panel of experts in sleep , anatomy , physiology , pediatrics , neurology , gerontology and gynaecology joined military group to create new , age - specific sleep good word .

Chart shows sleep requirements for different age groups.

Chart shows sleep requirements for different age groups.

a rendering of a bed floating in the clouds

A photograph of a woman waking up and stretching in bed.

a woman with insomnia sits in bed

A photograph of a silver clock in grass

Athletic couple weight training in lunge position at health club.

an illustration of x chromosomes floating in space

woman asleep holding a cup of coffee

How to fall asleep: Image shows woman looking sleepy

Image of woman sleeping with facemask and earbuds

How to sleep for longer: Image shows couple asleep

sleeping woman

Woman running in the early morning.

Infographic: The layers and functions of the human skin.

science budgets for federal government

infographic of nuclear power plant

Fukushima fuel rod infographic

infographic of human body sweat

Today�s GoFIgure looks at phobias, defined as irrational fears of things which are not likely to be dangerous.

An illustration of a hand that transforms into a strand of DNA