It was no use. Spock could just not find a comfortable position.
If he reclined on his right side, he put pressure on his ear, the one closest to the explosion he caused by casually tossing one of the exploding rocks on Gamma Trianguli VI. (How he did not lose his hands, his life, when he broke the rock in two was indeed a miracle, if he was so inclined to believe in them.)
Lying on his stomach proved to be problematic as well. He still had eleven puncture wounds from the poisonous thorns he had taken in the captain's stead. The flower had proven poisonous to humans, but his Vulcan blood had served him well. With minimal treatment from Doctor McCoy, Spock had survived the floral toxins, but his perforated chest was still quite sore and itchy.
Next, Spock tried sleeping on his back, but that did not last long. He was still recovering from the second degree burns he had suffered due to the lightning strike. His mother used to accuse Spock of being part feline. If that was so, Spock knew that he had used up at least two of a cat's nine lives that day. He marveled that he was not killed outright by that bolt.
The injury that most embarrassed Spock was the bump on his nose and the bruise to his backside. He had received both nearly simultaneously when he walked headfirst into that unnoticed forcefield and then was dumped unceremoniously onto his ass. Spock knew he couldn't sleep reclining in his chair. He could barely stand sitting down long enough to remove his uniform and boots. Stupid! he had chided himself. I hand a tricorder right in my hands. How did I not notice a forcefield??
Spock knew he had to get some rest. He was tired, sore, itchy, and nauseous. There would be only one place for him to find restful sleep that night. He covered himself with a Vulcan robe, toed on some soft shoes and made his way to the zero-g chamber in the Bio-Medical labs.
Spock set the controls to his liking, placed them on a timer and locked himself into the chamber. Soon he was floating, and soon after that he was sleeping, then dreaming. He saw Kirk and McCoy circling him in one of the corridors, heard them taunting him about looking like Satan. Spock sighed in his sleep. It had been an altogether disagreeable day.
I should have stayed in bed.