But first, coffee.
Studies have found that strategically consuming caffeine helps you flip the switch to get into your zone. Note the word "strategically" above. Drinking 2 cups of coffee has been shown to help you focus with more intensity, work longer without giving up, and improve short-term memory. In other words, it makes getting into the zone more comfortable.
However, the effect stops and even reverses once you drink 4 cups of coffee or the equivalent caffeine intake. Concentration is lost, and it's easier to get distracted and frustrated. So, go ahead and have a couple of cups before you are ready to enter the zone, but then switch to water so that you stay hydrated, which your brain needs to sustain the flip.
Now that I've got those creative juices flowing, how do I "Flip the Switch?"