I inferred that they unplug when their Surrogates power down to charge. I assume the people eat/pee/sleep as "normal"... I saw at least one catheter-like attachment to clothing, which I thought was a nice touch.
My only "pull you out of the film using logic" moment was the thought:
"How do all these regular workin' stiffs afford the Surrogates?!" There's no way these things are cheap, and I can't see people being able to have them in the numbers that they do at the prices they'd be charging... unless it's like cars? Lol. I know, it's just a movie
