I think I'm still trying to find my feet as an actor. And I know it ain't brain surgery, but it confuses me and it comes between me and my sleep a lot.

Sometimes I have experienced at the start of a film you're very excited and enthusiastic and you've done all your preparation internally and externally and you start the film and it's all go... Then your attention goes somewhere else. Your energy goes into telling the story, so you don't have the same amount of energy to be objective, and that's okay because sometimes you become a subject of the story and you're inside it so much that you don't need to keep on looking on the outside.

The idea of implanting memories where by the implantee couldn't tell the difference between a real experience and a fantasy experience was really cool. And his ideas of technology - do we control technology or does technology begin to control us? His work hasn't aged a day it seems.

I take acting very seriously. I put everything I have and know into it.

You consciously look after yourself, whatever that may be to you, whether it's going out for a few drinks and a bit of dinner, or just hitting the couch and watching TV, or going to the gym or yoga class. Just being aware that there's a potential for you to be in it and respecting wherever you find yourself is good enough.

I remember some of the sets on "Alexander" were extraordinary and it would just take your breath away.

Yorgos Lanthimos said, "What about if he's a bit soft?" And I said, "Yeah, I think you're right." He just comfort-eats a little bit too much. He's just asleep in his own life and has let himself go. And the mustache, I don't know if it was him or I suggested it. But I remember my sister was watching me eat and she was like, "God, does he have to be fat?" And in retrospect I couldn't think of David being any other way because it affected the way I moved. It really did. It slowed me down in a way that I felt was conducive to kind of tapping into the spirit of the character.