The Active Mind

I've read many topics that describe certain things that should be done like, getting adequate sleep, reducing stress, so on and so forth. Putting that aside..

... Is there a difference between a person that watches T.V. day in, day out or has mind numbing jobs like a factory worker that does the same thing all the time and doesn't exercise the brain, or someone who is a scientist or does mind puzzles like sudoku/crosswords/logic problem solving on a regular basis during the course of their day?

All in all, does an active mind make a difference for attaining lucidity?

I think it does matter a little. It especially matters if you're trying WBTB. Try solving puzzles in the hour you're awake, or just do some maths. I've tried it a few times, and it worked fine for me. :)