The Men Behaving Badly creator penned the script for this week's 'Amy's Choice' and told DS that the episode was influenced by his own dreams.
When asked if the episode's themes might be too complex for the show's audience, Nye quipped: "I'm a very mainstream, dumbing-down kind of writer and I wouldn't inflict anything too intellectual on the audience!
"It's a mixture. There are monsters in this episode, there are creepy old people. There are chases. There's a world which is freezing. I think the thrust of the episode is quite visual and quite accessible."
He added: "But Doctor Who's just great at being very teasing about interesting concepts - in this case the subconscious, alter-ego, a little bit about ageing, the answer to fear and nightmares about old age and things - but at its heart it's a scary romp."
> Click here to read our full interview with Simon