Geg watched for a bit, as Sherlock closed his eyes and fell asleep almost right away. 
When his berathing evened out, Greg carefully got up and siletnly left the room. He sighed, scrubbing his face with the heels of his hands and went into the living room, looking around. He couldn't think of anything to do for himself. The case didn't seem to be going any further until Sherlock could thik clearly about it all. He took a look at his phone. A few missed calls and messages. He took a look. All of them were from Donovan asking him what he was doing. He sighed again, and called her.
The next hour, he spend discussing, almost fighting, with his subordinate over the phone. When it was finally over, he could hear no more of it.
Greg heard a moan coming from Sherlocks room and got up to take a look. Sherlock, it seemed, was having nightmares. He was twitching and moaning and grimacing a little in his sleep, although it seemed that they were not bad enough to wake him up. Greg considered doing it himself, but then again, he wasn't sure whether Sherlock would appreciate it.
He sat down at th edge of the bed again and looked around, his eyes travelling over the bed. HE hesitated, then lay down, telling himself, it was just for a bit. Just for a bit... in a matter of seconds, he fell asleep.