It happens to everyone. But now its my turn, and its depressing at times. I play guitar and I'm extremely into blues, jazz, and the 70's/60's greats( Zeppelin, Hendrix, you name it). One thing I try to do more than anything is play from the heart and make it so that what ever sound comes out of my guitar paints an elaborate portrait for who that sound is going to. But lately my play seems unenthusiastic and boring almost and has lost that "spark". So I ask: How do you get out of this? How do you get back in that mindset where it feels like playing gives you pretty much a flat orgasm again? haha
Brian Eno evolved Oblique Strategies, a series of cards with instructions [of a kind] on, to be used in situations like yours [or more properly, when things weren't working out in the studio, but close enough...]. You drew a card and tried to follow its instructions, hopefully it'd set things moving again creatively. And of course there's an online version... http://stoney.sb.org/eno/oblique.html Flick through them and see if anything stirs...a lot of them are pretty oblique, but they should get you thinking