Pretty kewl eh? Yes, that is one of the reasons sleep is so important! The brain continues to work on processing the day's thoughts and activities etc., while we sleep at night. It's when we are overwhelmed that the nightmares and such come... but generally we don't even realize it's working while we sleep.
There are more than one part of "final" phase I think. If it's an object/activity (such as elevator use) then you physically go and look at it as the next level, until you're ok with that. Then you might go up and hit the button, then maybe get on and right back off... see?
You can do this, just go slowly enough so you don't freak yourself out over any part of it.
