I also just awaken, totally dazed, disoriented. I was having this ongoing nightmare about being in the crowd in a similar situation. I was bewildered in the nightmare and disoriented upon awakening.
It's taken an hour to re-orient myself and to calm down.

My H wanted to watch the news last night, in order to catch up on the story. I heard a little and then had left the room. (I had already seen a lot earlier in the day and could not watch more.) I went right into distractions. Yet, here I am awake in the night.

I'll bet many people have disturbed sleep tonight due to the Vegas incident.
Some will for a very long time.

My heart goes out to them.

WC