As I know, dreams —specially dervish dreams— are very important in some sufi orders. Do anyone know some studies, books or articles related with this regard. Years ago I knew about a buddhist book about dreams and dreaming which particular topic is the "yoga of dreaming". I am particularly interested in knowing if there is in the sufi path some knowledge about how to prepare oneself to the state of "openness" previous to a dervish dream to apear and if there is some guide or advise once I am aware that I am "inside" a dervish dream.
if there is some guide or advise once I am aware that I am "inside" a dervish dream.
This article pretty much defines most of Dreams and dream interpretation
how to prepare oneself to the state of "openness" previous to a dervish dream to appear
May be not dervish, but, preparing oneself for a truthful dream, as suggested in the article, be truthful in your actions during the day, then there is a possibility of getting truthful dreams. Moreover, as I discussed above, it is very very difficult to even judge our actions when we're awake whether they're right or wrong, then it similarly difficult to judge if a dream is truthful/divine or not. Example, if you get a dream "Go & kill an innocent person", you can manage to decide it's a stupid dream, but what if you get a complex dream, whereby it becomes difficult for you to decide whether to follow it or not. So, the Islamic way of trying to achieve truthful dreams would be get closer to Allah as much as you can. Remember Allah much. But conditional you're following the Prophet (pbuh) perfectly. And as always, be truthful in your actions.
Piece of advice, don't solely rely on your dreams.
May the creator guide us all.
Note: This is not a Sufi perspective, but thought I could someway help you to explore the truth. If you wish to downvote, plz go ahead, I don't mind.