After controlling for sleep duration and insomnia, use of sleeping pills was also found to be associated with an increased mortality rate.The lowest mortality was seen in individuals who slept between six and a half and seven and a half hours per night. Even sleeping only 4.5 hours per night is associated with very little increase in mortality. Thus, mild to moderate insomnia for most people is associated with increased longevity and severe insomnia is associated only with a very small effect on mortality. It is unclear why sleeping longer than 7.5 hours is associated with excess mortality. Epidemiology
Between 10% and 30% of adults have insomnia at any given point in time and up to half of people have insomnia in a given year, making it the most common sleep disorder. About 6% of people have insomnia that is not due to another problem and lasts for more than a month. People over the age of 65 are affected more often than younger people. Females are more often affected than males. Insomnia is 40% more common in women than in men.There are higher rates of insomnia reported among university students compared to the general population. Society and culture
The word insomnia is from Latin: in + somnus "without sleep" and -ia as a nominalizing suffix. The popular press have published stories about people who supposedly never sleep, such as that of Thái Ngọc and Al Herpin. Horne writes "everybody sleeps and needs to do so," and generally this appears true.
References
External links

MAPS Parent Support group for parents with Anophthalmic and Microphthalmic children
http://www.anophthalmia.org/  ICAN - International Childrens Anophthalmia and Microphthalmia Networkmicrophthalmia]  

MACS - Microphthalmia, Anophthalmia & Coloboma Support Europe’s largest charity supporting people affected by Microphthalmia, Anophthalmia and Coloboma
www.baam.org.uk BAAM Bilateral Anophthalmia and Me
Anophthalmia and Microphthalmia Resource Guide from the National Eye Institute (NEI). GeneReviews/NCBI/NIH/UW entry on Anophthalmia / Microphthalmia Overview
NCBI/Molecular diagnosis of anophthalmia/microphthalmia
MACS The Micro and Anophthalmic Childrens Society - Offers support and Information to families in the UK and around the world