In the brain, valerian is thought to bind to receptors for a nerve
chemical called GABA (gamma-aminobutyric acid). By blocking some nerve
impulses from reaching the brain, the herb seems to shorten the amount of
time it takes to fall asleep as well as improve the quality of sleep
that results. And, unlike some of the more commonly prescribed sleep
medications, valerian is not addictive. Nor does it cause morning
grogginess (when taken at recommended doses), as some prescription drugs do.
Numerous studies of insomniacs have shown that those who take valerian
fall asleep faster than participants given a placebo. The quality of
sleep improves as well, according to several recent studies. In one
placebo-controlled trial of 27 people with insomnia, Swedish researchers
found that 89% of those who were given a valerian preparation reported
improved sleep, with 44% rating their sleep as 'perfect.'
Even more impressive results emerged from a well-designed 1996 trial
involving 121 insomnia sufferers. Among the benefits of valerian root
extract taken one hour before bedtime (2 tablets of 300 mg each):
significantly improved sleep quality, dream recall, and sense of
psychological well-being.
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