I go through periods when I expend a lot of effort on meditation, reading books like the Tao Te Ching, I Ching, or Buddhist Sutras, etc.. then I go months or less often years without. What I've found to be most rewarding is to lay flat on my back, eyes shut, with relaxing music (whatever that means to you) that preferably doesn't have a lyrical component (vocal is okay for me.. Sigur Ros has no lyrics to me as I can't understand any of it.. just a vocal instrument). Then I focus on my breathing and try not to think, but just to take in what I'm sensing without analyzing it. I sometimes put a phrase, question, etc on a piece of paper and tape it somewhere in front of me, then when I've reached the right point, I open my eyes and my thoughts start from the prompt I've given myself. At this point I've already integrated my environment into my brain, and it moves to the back of my mind, and the only thoughts running through my head are a lot more focused than normal, and it often leads to insights that break me out of my meditative state like a needle full of amphetamines. Hope that helps.. it's what works for me.
edit: It all hinges on whether or not I fall asleep first though.