I go through this too. I find it often happens to me when I let the studio get piled up, disorganized, over-run, just plain messy. Then I don't want to straighten it up and just sort of close my eyes to it when I go by. And that's hard because the studio is my *living room*!
So, when I make myself put things away, shelve partially finished projects neatly, rearrange fabric, dust and vacuum, and clean my machine, I find that the desire to begin again is quite pleasant and strong.
Jan in VA