This sort of thing has happened to me in more than one area. I paint, write and knit and invariably I have those "un-inspired" moments.
For painting, I watch instructional technique tapes and soon find myself itching to pick up the brushes.
For writing, the answer is to just write. Even if uninspired, and even if most of what I write ends up edited out, just letting the universe know I'm determined will help me punch through the block.
As far as knitting, if I'm having the kind of situation you describe, I set it aside and take awhile to go do something else creative, if it's only sorting out a sock drawer! When I see the results of even so mundane a task, it often inspires me to continue the creativity with my knitting. The knitting is actually like a carrot on a stick!!!
Creativity can ebb and flow in any activity, but as the creators, it's really up to us to punch through!
So good luck and happy knitting!