Anakin had a point, because Anakin himself is the other person whose absence would have been conspicuous enough to wake Obi-Wan from a dead sleep and send him searching.
Siri's answer was reassuring, if also maddening. And matches Anakin's enough that he speaks his reply out loud.
"Ah. Just... Because it occurred to me when we decided to look for you that perhaps you didn't want to be found."