"i was taking xanax 2mg 3x a day for bout 10 yrs due to a motor vehicle accident with panic attacks that mimic a heart attack along w enxiety it definitely knocked me out at night but i recently got off em weened of but still feeling withdrawals a month later,it gave me the worst insomnia and thought i would die from it,i was finally given klonapin 1mg in morn and at night and i am finally sleeping again and my circadian rythem is getting back to somewhat normal,just hoping when i get off these the insomnia and benzo withdrawals don&#039;t return,but again working great so far...."