“I think a lot if life is (like) that. Your subconscious goes ‘click, click, click’ and ticks through all the algorithms and ideas.
“So brushing your teeth, honestly, sometimes things go ‘boom, boom, boom’.
“I’ve thought of entire shows brushing my teeth.”
When it comes to putting pen to paper, Davies locks himself away.
“I’m very suspicious of those people who sit in cafes,” he said.
Though it has been almost 20 years since Doctor Who returned to TV screens in 2005, Davies still gets nervous before broadcasts.
The latest Christmas instalment of the series is being shown on One on Christmas Day.
The episode, named Joy to the World, is about a hotel with a different world in every room.
“You do feel the pressure and you should, that’s part of the job,” he said.
“You get the fear, you don’t want to disappoint.
“You’ve got to say something new, you’ve got to have impact, so that is a great fuel to the engine all that stuff.”
