Shut the computer.
When I need inspiration but my mind won’t play along, I shut the computer or whatever I’m working on and walk away. Then, when I’m doing something totally unrelated — taking a shower, gardening, driving somewhere or lying in bed half asleep — that’s when the light bulb comes on. Happens every time.
Quit being logical.
Near as I can tell, the part of your brain responsible for creative ideas is not the same as the one responsible for reasoning. Inspiration is not logical, nor is it task-oriented. I believe most people have a much easier time accessing that part of their mind when they’re relaxed, tired, engaged in some mindless task or casually bouncing ideas around with someone in an unusual but safe surrounding.
Be alone with yourself.
I’m not an expert on meditation, but I do practice mindfulness as a means to quiet my thinking brain so I can spend quality time with my deeper, more intuitive inner self. I’m still a novice, but I think it’s indispensable for neurotic people who tend to over-think things with voices in their heads, as I’m known to do.