In the episode about McKay's "second childhood", after John and Rodney sat on the pier with beer and had a heart-to-heart talk, I want to believe that then they returned and John offered to spend the night with him so as not to run around the cabins. After all, he suggested it at the very beginning, when his terrified friend came running to him.
(I tried to depict a relaxed light from those panels that are located in each room, but it turned out to be too bright)
It seems to me that the moment I depicted is a bit mawkish, but due to the situation, this is the best that John could offer him. McKay is scared, confused, and very outraged that his brain is degrading, and he's still aware of it. He curled up and pressed his arms to his body, falling asleep more or less normally, feeling calm and protected. But John didn't even close his eyes all this time, replaying Rodney's last words in his head and sometimes glancing at him with concern.
It seems that his arm has already gone numb, and unpleasant tingling has begun. Sheppard decided to try to change his position a little, but it would be a real success to free his hand. John inhaled and held his breath, carefully starting to remove his hand from under McKay. Because of John's movement, Rodney shifted his head and put it closer to his friend's chest, pressed his hands tighter to his body and shifted slightly, finally languidly and deeply sighing, continuing to sleep. John exhaled in frustration and abruptly relaxed, sprawling on the bed, realizing that he was trapped. At least he was glad that there was less pressure on his arm now, and he gently stretched it, getting rid of the tingling.
It was a little unusual to feel Rodney's breath so close. It's too dark, too quiet, too drunk to ignore his calm monotonous breathing. John finally gave up trying to get out, which caused a quiet chuckle to escape from him. Either from hopelessness, or from the way McKay sighed softly again.
But what will happen in the morning? What if McKay wakes up later and finds no one around, gets confused about where he is, or tries to figure out what kind of place this is by shouting someone's name? Or vice versa, will he wake up earlier, and how about shaking John (or screaming) to wake him up and find out why he's in the same bed with him?
I like to imagine the chemistry between the characters, which can be off-screen. What could be the consequences or what consequences would actually happen.