Turning your mind off is not an option with this mix. You have to exhaust it. Otherwise, you'll just lie awake, playing with visions of all the things you'd rather be doing -- all the things you could accomplish with this time instead of just wasting it.
This is me trying to go to sleep every night. I know it'll take at least an hour for my brain to wind down. Also, Gemini over here, so... yeah. Let's do this!