The actor told USA Today that he enjoyed channelling the Time Lord's love of the festive season while filming the one-off episode 'A Christmas Carol'.
"He loves Christmas," he said. "It's showcasing humans at their most open and giving and kind. It's everything The Doctor's about."
In previous holiday specials, The Doctor has fended off an invasion of earth by the menacing Sycorax, prevented a space replica of the Titanic from crashing into Buckingham Palace, and battled the Cybermen in the snow-covered streets of Victorian London.
As he approaches the one-year anniversary of his first on-screen appearance as The Doctor, Smith suggested that he is beginning to understand the way that the alien's mind works.
He explained: "I love his madness. I love his brain. I love that he's completely silly. I love how lonely he is. I love his bravery. I love the fact that he's clumsy."
'A Christmas Carol' will air on Christmas Day on BBC One in the UK and on BBC America in the US.