When you write, do you get into 'the zone'—a mental state where time disappears and you are one with your craft? You look up at the clock after a while, bleary-eyed, and discover it's been hours since you started writing. Carl Jung called this sort of thing accessing the active imagination. Maslow called it 'Being Cognition.' Whatever you call it, it's fabulous and desirable. It's where we can produce our best creative work.
You can boost your ability to get into the zone through meditation. A daily meditation practice (even if it's really four or five days a week) can do wonders. You essentially train your mind to go deep and stay there for a while. It takes about a half hour a day, and can give you the energy to be productive for many hours at a time.
I think just about any kind of true meditation would work. It's the process of inner focus and letting go that we want to foster so we can develop the abilities we're after.
But if you're like me you have a hard time making your mind go completely quiet. For those of us with stubborn, restless minds, an active-mind method works well. One that I think is really well-suited to the creative process is called Creative Visualization. In addition to training your mind to go into the zone, you can utilize it to actively explore specific issues you may be having with your characters, story line, setting, whatever.
You may have heard of Creative Visualization. It was popularized by Shakti Gawain in the '70s and '80s. She wrote a book on it, and it's still available (CREATIVE VISUALIZATION, by Shakti Gawain). I came across the book in a used book store years ago while I was traveling. I was fussing and feeling pressured by my job in New York, and wanted something to read on my flight home to take my mind off my worries. And there it was. A book about using meditation to visualize success to make it happen. I no longer wanted to take my mind off what was bothering me. I wanted to fix it. I read the whole book (it's not long) between wheels up and landing, and started meditating the next day. The method was excellent for helping me effectively communicate my ideas at work. Years later, when I became a writer, it was the most natural thing in the world to translate that experience to a more deeply personal one that I could use to develop my novels.
Here's the process:
I wish I could give you the details in this post of how to learn Creative Visualization, but really the best way is to read the book and follow Gawain's directions. Warning: Shakti Gawain is very directive in her methodology. If you don't like being told exactly what to do, you may feel some resistance. Also, Gawain's method falls into the 'woo woo' category, in that she directs you to connect to and commune with a 'guide.' (Not a problem for me. I can accept a guide as either a spiritual being who visits me or as a cognitive construct from my unconscious. It's possible they're the same thing. :) The mind is a powerful tool.) If you can accept these conditions, you can use this process to open yourself to your deep mind, where hidden knowledge lies.
Best of luck to you. I hope you enjoy meditation as much as I do. I know that if you like it, you'll find ways to use it that will enrich your writing. As a bonus, you'll feel calmer and more energized at the same time, too.