In theory - in theory - it should be impossible for a gifted Jedi knight, especially one said to be as sensitive and alert as Obi-Wan Kenobi, to be surprised by the presense of someone in his bedroom.

But it had been a long day, first with Anakin's training and then running off to deal with a minor disagreement on Abregado, which when he got there turned out not to need a Jedi at all in his opinion. He came back late, was ambushed by Quinlan Vos, who seemed incapable of keeping regular sleep hours, and by the time he made his way into his room his Force sensitivity was clouded by the heavy fog of needing to sleep.

It could also be that Anakin posed no threat at all to him and so he didn't even register him as something to avoid.

Having then kicked his young Padawan, he sighed, annoyed at himself, and unable to deny a flash of exasperation as he rubs a hand over his tired face.

Of course he couldn't sleep yet. That would be too kind.

"Anakin," he said, his voice clipped and clear in the dark silence of his room, and probably sounding slightly more annoyed than he intended it. "You're in my room again."