Most of my best posts have come to me while I was doing other things... usually cooking breakfast, which is why I keep paper and pencil with me at all times. Just because I get an idea doesn't mean I go running for the computer... I just take 90 seconds to jot down the highlights of the idea, and then go back to what I was doing.
It's easy to put too much pressure on ourselves... get into a "produce, produce, PRODUCE" routine. I try to remind myself that this is also supposed to be fun and rewarding, not just a dutiful obligation!