Daniel Craig and Rachel Weisz sleep in separate beds to stay in character for their Broadway show.

The pair - who wed in 2011 - play a married couple in a new production of Harold Pinter's Betrayal on the New York stage where Rachel's character Emma cheats on Daniel's Robert, and to make sure they can do their alter egos justice they have been taking their roles "very seriously."

"Daniel and Rachel are taking their roles very seriously. When the curtain comes down they are staying in character to keep momentum and have taken themselves to separate bedroom to keep focused. They feel they cannot go home and snuggle up together at night and then switch into character," a source said.

Daniel, 45, and Rachel, 43, began dating in December 2010 before the release of 2011's psychological thriller Dream House when they were again cast as a couple. Since they tied the knot in June that year they haven't worked together and their dedication to staying in character off set has worried the play's production team. "It's been a big talking point backstage and the production team were a little concerned as Daniel and Rachel haven't worked together since they married," the insider added.