That depends on which version you believe Luke's version or Kylo's. That's your right not agree.
Kylo wakes up, turns over and sees an activated lightsaber. What should he think in that situation? I believe it would be the same reaction as anyone waking up, turn over and see a gun hovering a few feet away. Anyone would think that the person with the weapon was trying to kill them.
Of course, Kylo’s own account that he shared with Rey verifies that he ‘defended’ himself after suddenly noticing his uncle standing beside his bed where he was laying—presumably asleep.
Hmm.
The one thing that has always bugged me was the slo mo lightsaber scenes in the first trilogy. In the second trilogy, lightsaber fighting was outta this world fast.
So... thinking back to that pivotal scene in TLJ... I should believe that Slow-Poke-Lightsaber-Luke did not have enough time to slice Kylo in those moments before he awaken. That is plausible since he has never shown quick reflexes in any prior film. A two foot swipe with a lightsaber? That would take a LONG time.
Okay. I am outta this thread.