Jack had been feeling uneasy for last couple of days - he found myself falling asleep during his break - the constant nightmares and howling during the night kept him from having a restful sleep. Jack could see bags forming around his eyes - he'll probably have to take a short break into to be 100% - he knew that forcing himself wouldn't do anything good.
And yet, he found himself with an abundance of energy, he felt that restless energy within him. He found himself fixing things around the hospital - like straightening a portrait that was slightly tilted or checking each pen to see if they worked. He told himself it was just restlessness from the lack of sleep. Which, he also assumed was the cause of his constant irritation - finding himself annoyed with people and their excuses.
He sighed. Better drink my coffee and get back to work.