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The new study was run over six months at 12 VA medical centers with about 300 participants, half of whom were given a placebo and half of whom were give prazosin.

A couple of weeks after starting prazosin, Hall told Raskind he was sleeping through the night for the first time since his military service in Vietnam.

Thousands of people with post-traumatic stress disorder have taken the drug prazosin to ease the nightmares and disturbances that stalk their sleep.

Some researchers not involved with the study were quick to say that clinicians should still prescribe prazosin for some patients; Raskind, director of the VA Northwest Network Mental Illness Research, Education, and Clinical Center, agreed.

Perhaps, they speculated, only patients experiencing some distress respond to prazosin.