Oh, all the time. Some things that help me overcome it: 1) Sleep on it. Some of my best ideas come to me when I'm trying to go to sleep! 2) Participate in flash fiction writing contests. Not only do they get the creative juices flowing, but they offer valuable feedback. 3) Seriously, just take a break. You don't have to feel pressured to write every waking hour. Read or take a day trip somewhere. Inspiration may strike as you're reading or observing something new.
