Study: insomnia linked to earlier death

Having any of the four types of chronic insomnia carries an increased risk of death, according to a new abstract (#0607) on display at SLEEP 2010.The 20-year study followed tracked the health problems and sleeping habits more than 2,200 people. Each subject responded to two to three mailed surveys in 1989, 1994 and 2000. Using the social security death index, researchers found 128 study