Hi Filip Zmysłowski

My thought on that subject is that further improving the lucid dream therapy should involve identifying/developing and testing effective "lucid dream control strategies" that can help the persons to cope with their nightmares once lucidity is achieved. Our article titled "High-level control in lucid dreams" is a step in that direction.

Article High-Level Control in Lucid Dreams

There are reports of people learning to use lucid dreams to confront and even dialogue with the entities that show up in their nightmares. Personally, I have not had experience with this technique but you may find worthwhile information in the Lucid Dreaming group on Facebook.

I'm sorry to be so evasive (because I don't remember the article very well) but I've read that other techniques have, for the moment, equivalent or better efficiency and easier implementation. But i guess the work of M Carr/M Blagrove (and others) on LD induction might be a game changer.

On a personal note, but not specifically about the nightmare, I believe that LD may be worth investigating for its therapeutic effects on the grieving process.

These might be of use :

Article Best Practice Guide for the Treatment of Nightmare Disorder in Adults