Disturbing? Wierd. It's basically just running around with a camera, sped up. It goes from a lot of beautiful nature stuff, to man messing it up, then to some of what man does being beautiful, though not all, and ultimately back to nature again. I can't remember anything disturbing though.
There's some incredible stuff in it, clouds moving just under a shot from a mountain top sped up to where you see them wave, a similar one where they go from rough, hit the mountain, and get very smooth spilling over, and my favorite - a person in traffic hits their brakes, and there's a sine wave that pulse back about the next hundred cars of everyone stopping and then going again.
Poor explanation, but super cool movie. Not sure what was disturbing. I didn't fall asleep either, I thought it was pretty incredible footage. To each his own I guess.
Well, if you haven't seen it, and spot it at the rental store, I highly recommend it!