I love to wake up early when the house is all quiet and do a couple of puzzles with a cup of coffee to get my brain going.
Some of my favorites are the Set Daily Puzzle and Suduku.
Funny how I can tell when the caffine hits my brain. All of the sudden I can "see it". Before that, I'm just starring at the puzzle and not seeing any patterns. I think this type of puzzle wakes up both sides of my brain -- analytical & creative.