Over 12 days, these patients received on average about 20 HIRREM sessions each, with symptoms recorded both before and after.
"We observed reductions in post-traumatic symptoms, including insomnia, depressive mood and anxiety that were durable through six months after the use of HIRREM, but additional research is needed to confirm these initial findings," Tegeler said.
The control subjects, who continued their existing insomnia treatment without HIRREM, showed no change in ISI.
Ten people were randomized to receive HIRREM sessions, plus usual care; the remaining 10 were assigned to the wait-list control group.
Study participants randomized to HIRREM underwent eight to 12 sessions that each lasted between 60-90 minutes.