I have to admit i love 'Dune'. I can completely see why it might send people to sleep though. I love the edgy feel it has (thanks to Lynch of course).
It's epic and bleak with a sense of darkness which i like in sci-fi. i actually think it suffers from heavy editing though and the fact Lynch lost track a bit whilst filming due to the scale of the project. I heard there is alot of unseen footage so have been waiting years for an even longer version to appear.. haha..
Not everybody's cup of tea though.