Really, the only thing he needs to do is confirm that Reed is present at all.

It doesn't take long.

After some debate, he decides against spying on the sleeping vampire for the rest of the day. It probably wouldn't tell him anything useful, and he's a little tired himself. And it might be construed as a creepy thing to do.

Sherlock goes home again, sends Cal a terse email informing him of the address, and sleeps like a log until midafternoon.