Steve Hassan also wrote in Combatting Cult Mind Control:
Nightmares, guilt, and other emotional problems:
These are a good indication that the former member needs to receive additional counseling. They come from an unconscious mind which is still wrestling with issues of involvement. Some common nightmares include being trapped somewhere, feeling that people are out to get you, being in the midst of a storm or a war, or talking with friends still in the group and trying to get them to leave, while their friends are pressuring them to rejoin...
He wrote this before he really had any knowledge of the WTS and issues of ex-JWs.