During that, I kept thinking what if that was what set Oscar off? He seemed to have been very uncomfortable and hot when he supposedly woke up. In general, he seemed to be in a cranky-type of mood from the very beginning....I don't know if cranky is the right word, but he mentioned several times how tired he was....long day....just wanted to rest....etc..
So he's already got that state of mind, then he wakes up hot and sweaty. Then he realizes that Reeva did not do what she was supposed to do - bad girl. Bad girl's actions, or inaction, made him wake up miserable and cut into his precious rest-time. You know, serious athletes need their rest and all that.
Maybe this is what set off the argument. They argue about this, leading to arguments about other things (we all know how these things can go sometimes) - this is the hour of arguing that the witness heard. Things escalate and we get to where it unfortunately ended up.
JMO.