Sherlock let out a long sigh. If he wanted to get the man's memories back, he was going to have to be honest with him.

He walked over to the loo and spoke through the door. "No. " He said simply. "I am not human." He didn't really want to elaborate on that.

"I don't need to sleep, but I want to stay with you." He said, loudly enough that he knew he could be heard. "I can stay with you in your bed until you fall asleep. And I can be there when you wake in the morning, if you would like for me to."