Steve walked into the workshop with a strange expression on his face. Tony wouldn't have even noticed that he entered, but he had happened to flip up his welding mask for a sip of his drink. With the glass frozen halfway to his mouth, Tony stared at the Super Soldier.

"Cap? Hey Steve? What's wrong with you?" Tony's forgotten drink felt heavy in his hand.

Steve shuffled closer to the table, picking up a spare part and turning it absently in his hand. On closer inspection, Tony noticed that Steve's skin was pale with dark circles under his blue eyes.

Their Captain hadn't been sleeping.

Tony placed his welding mask on the table and cautiously made his way over to the other man. He paused when he was within arm's reach of his teammate.

What now, genius?

Tony opened and closed his hands uncomfortably. "Steve, you've got to talk to me, buddy."

He cleared his throat and placed a tentative hand on Steve's left shoulder. "You're looking a little less chipper than usual."

Steve flinched away the moment's Tony's hand made contact, reeling back and staring at Tony like he hadn't realized he was there until now.

"Howard?" Steve blinked rapidly and furrowed his brows. "Tony, what's going on?"

"Steve, how bad is it?" Tony's hesitancy to touch his teammate left as he searched for an injury. "Tell me where you're hurt, I can have Bruce down here in five seconds."

Tony quickly glanced up at his Captain's face. "Well not actually five seconds, but maybe a minute or so. Talk to me, Cap."

Steve warily watched Tony, swatting his hands away as he searched for some imagined injury.

"Stark, I'm fine." He stepped back and looked at the inventor like he'd lost his mind. "I want to know how I got down here. Last I remember, I was in bed."

Realization dawned on Tony's face and he bit his lip to keep his laughter at bay. "Cap, were you just sleep walking?"

Steve turned red and crossed his arms over his chest. "What are you talking about, Stark?"

"Well you sauntered in here all zombie-like, seemed completely oblivious to me being here, and you freaked out when I touched you." Tony ran his hand through his rumpled hair. "And here I thought you were bleeding out or had been concussed."

He pointed an accusatory finger at Steve and wiped grease-stained hands on his t-shirt. "Way to almost give me a heart attack, Cap."

Steve looked sheepish for a moment and then glanced down at the floor. "I didn't know I still sleep walked."

Tony couldn't contain his laughter this time. He dissolved into giggles when Steve glared at him. It was probably supposed to be an intimidating expression, but the scare-factor was really decreased when said-scarer had just sleep walked into your lab.

"Honestly," Tony said, "it's probably better me than anyone else on the team. You may have startled Bruce into unleashing our favorite green destruction machine. Nat and Clint may have actually killed you. And you may have been fried extra crispy if you snuck up on Thor."

Steve sighed and looked around, really taking the workshop in for the first time that night.

"Well I'm already up," he said. "Do you need a hand with anything?"

Tony fought down a smile with an exasperated grin. "If you insist, Cap."

He pointed toward the corner to a cherry red sports car. "You wanna be my jack?"

God, so many dirty jokes possible, but I'll go easy on him. He just woke up and he's embarrassed.

Steve nodded.

For the next few hours, Steve casually lifted cars for Tony to work on. Tinkering was always therapeutic for Tony, but having the genius' quiet presence was therapeutic for Steve.

When Steve headed to bed, Tony quietly asked JARVIS to keep him updated on the Captain's whereabouts. Steve slept soundly for the rest of the night without so much as a twitch.