The 66-year-old actor, who spends two hours in the gym every day, insisted on doing his own fight scenes in new action film Sabotage, but has to take it easy when the cameras stopped rolling.
He told The Sun: "Yeah, I sometimes take a nap in the afternoon.
"I sometimes take them when I feel sleepy and I am at home, then I have the luxury of lying down for an hour."
But the former Governor of California, who will start filming Terminator 5 in coming weeks, doesn't get chance to snooze on set because of his hectic schedule.
He explained: "You get an hour lunch break and then you work until seven at night, so [it’s] not like, 'OK guys, why don't you continue, I am going to take a little nap... There's not time for that."
Although the Expendables 2 star still gets "trashed around" during scenes, his body doesn't recover as quickly as it did when he was a young actor, but he insists he is still up to the demands of physical roles.
He said: "If you don't like that then you are in the wrong business.
"It's like if you do something unusual and you are tired, the next day your body doesn't come back as quickly as when you were 30 years old. But, other than that, I can still do all the running, the jumping and the fight scenes."
