I'm relatively new at this fiction thing, but I've been writing long enough to know my moods affect my writing. When I'm upbeat and happy, the prose flows and I come up with some funny lines. But when I'm tired or down, I have to force the words onto the page only to wish I hadn't bothered.
What about you? Do your moods and energy level affect your writing? Do you write anyway? Or put off the word count until your sun comes out again?
Enjoy the music while you type your reply. :)