Dean & Sam

After a couple hours of driving Sam got tired. He pulled over and poked Dean to wake him up. Dean sat up and rubbed his eyes. “What?” he mumbled sleepy.
“Your turn to drive” Sam said. He stepped out and walked around the car, while Dean moved to the driver’s seat. Sam stepped back in at the passenger seat, but Dean made no movements on starting the car.
“I’m tired, Sammy” he said soft.
“You’ve been sleeping for the last two hours. How can you be tired?” Sam asked surprised.
“I mean I’m tired” Dean repeated and he turned to Sam. “I’m tired of it all. I’m tired...