People's moods change from day to day, even from minute to minute. A day that starts out clear and sunny may end with a ferocious thunderstorm; your smile may morph into a grimace. I've noticed my mood leaks into my writing. Is this common?
Characters grow and change. I do character sketches before I begin but the little creatures continue to astound me. As I continue along I've noticed each of them has their own rhythm; which has necessitated me going back and making sure it's consistent. Some are incredibly well-spoken, some are not. Some have trouble putting their feelings into words. Some (bless their hearts) just want to think about the food. However, they're all picking up my mood.
Yesterday was a very grey and rainy day here and my mood had the same forecast. It was one of those days where you think 'what's the point?' and 'I'm never going to finish this monster' even though my word count is getting fairly healthy. My characters picked up my mood. They began to quarrel. Someone who I had thought was fairly polite said something that made me take my hands off the keyboard and look twice. I may have uttered a colourful metaphor. Fairly polite and gently-brought-up girl has a bit of an attitude. Who knew? Other characters were saying things simply to get under one another's skin. Tensions rose. One character got up and left. These people are not getting along; which is tricky when they're stuck with each other for quite a few pages yet!
I'm pleased their polite masks are starting to slip, but what is going to happen if I'm writing when I'm in a terrible mood? I have visions of discovering instead of one murder, my poor detective is going to be surrounded by a bloodbath. On the other hand, perhaps everyone will shake it off and continue with their day.
I think, as writers, we're so deeply involved in our characters that we can't help it when they pick up our vibrations. I certainly feel for them and their situation. I have dreadful guilt about some because I know their endings. I'm very happy for others. All of them make me laugh.
Take a quick look at what you're working on right now. Can you tell what mood you were in when you wrote it? Are your characters sponges?