'Mad Men' was challenging: Jon Hamm

London: Actor Jon Hamm says his role of a troubled ad agency boss on the hit show 'Mad Men' took an emotional toll on him.

The 44-year-old actor recently completed a 30-day stint in rehab for alcohol addiction and though he has not blamed the show, in which he plays Don Draper, for his struggles, he has found his job "challenging", reported Grazia magazine.

"Don is a difficult headspace to be in for a long time. Acting is not physically demanding necessarily, but it takes an emotional toll, especially when you're playing a person who has a lot of emotions. You can have some sad days at work," Hamm said.