Road Trip Insanity

The sensation that becomes travelers after 5+ hours in the car, particularly when driving at night. Road trip Insanity includes saying things that don't make sense, laughing hysterically at things that are not funny, and a general sense of "loopey-ness"
Once travelers have reached the point of Road Trip Insanity, there is not turning back.

Bob- I'm validated!
Tom- I'm inebriated!

Sally- Looks like you guys have a bad case of Road Trip Insanity.