Saoirse Ronan has revealed that Ryan Gosling hired a dream analyst to work with the stars of his upcoming directorial debut How To Catch A Monster.

Ronan, and her co-stars Matt Smith, Christina Hendricks and Eva Mendes, used to write down the details of their dreams and discuss them with each other as Gosling aimed to bring them closer together and to allow them to bring their personalities to their roles.

The star told Vulture, "[The letters would read], 'Dear inner self, if it is your will, reveal to me in a dream tonight what my character's relationship is to this other character'. We would come in the next day to discuss our dreams with each other, and act them out.

"I'd tell Greta (the analyst), 'Listen, I don't know what this is, but I was doing this last night, and then this person popped up [in my dream]', and she'd make sense out of it. That was our rehearsal. It made us become very close. It was a very new method for me, because all of a sudden, Ryan was encouraging us to incorporate our own personalities into our characters, how you feel about things, what your anxieties are, and things like that."

How To Catch A Monster is set for release in late 2014.