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Study links primary insomnia to a neurochemical abnormality in young and middle-aged adults
Date:10/31/2008

misunderstood complaint of insomnia.

"Recognition that insomnia has manifestations in the brain may increase the legitimacy of those who have insomnia and report substantial daytime consequences," he said. "Insomnia is not just a phenomenon observed at night, but has daytime consequences for energy, concentration and mood."

This preliminary study included 16 participants (eight men and eight women) who were screened to be free of medical and sleep disorders, as well as anxiety and mood disorders, and who were not taking prescription medication. Ages ranged from 25 to 55 years. Researchers recruited people who had difficulty initiating or maintaining sleep with resulting daytime distress or dysfunction for a period of at least six months. The average duration of participants' symptoms was 10 years. Objective data were collected by actigraphy and overnight polysomnography. Proton magnetic resonance spectroscopy (1H-MRS) was used to non-invasively determine GABA levels. For statistical comparison the study included a well-matched control group consisting of seven women and nine men.

Significant correlations were found between GABA levels and both subjective and objective sleep measures after adjusting for age, body mass index (BMI) and gender. In subjects with primary insomnia, sleep continuity, as measured by minutes of wake after sleep onset (WASO) on sleep study, was strongly associated with GABA levels.

According to the study, reductions in brain GABA levels also have been observed with 1H-MRS in major depressive disorder (MDD) and anxiety disorders. Primary insomnia shares many features with anxiety and depressive disorders, including sleep disturbance, elevation in anxiety, and impairments in concentration and energy. In addition, primary insomnia is an important risk factor for incident mood and anxiety disorders. The study raises the possibility that GABA deficiencies seen in people with mood and anxiety disorders may
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Contact: Kelly Wagner
kwagner@assmnet.org
708-492-0930
American Academy of Sleep Medicine
Source:Eurekalert

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