I was reading some various forums today, and I came across a lucid where sex was involved and the author of the post said that he was "out of breath" at the end of the event. This leaves me to ponder, can one become tired in a dream? Like if I decided to run faster than the cars on the highway would I start to pant, and would my legs burn?

Has anyone experienced this phenomenon? I haven't been lucid yet so I'm not sure. Since it is in your mind it shouldn't affect you, but would your mind trick you? could you tell yourself that you can't get tired and then run as far and as fast as you like without worry of exhaustion?