I was prescribed ambien when I was also on prednisone. It was the second time I was going on prednisone, and I was refusing to let them put me back on it because of the insomnia I got from it. So, they gave me ambien. It seemed to work fine for me countering the side effects of the prednisone.
Also had it on my second deployment, when the flight surgeons gave it to us to counteract the "go" pills they were also giving us...