Definitely. If I’m in a bad mood; not always, but mostly, this will affect how I perceive my system. When I find myself in a cranky, crappy mood, I just don’t bother sitting down to listen. Luckily, I’m a mostly happy-go-lucky, philosophical, pragmatic, optimistic person, so this doesn’t happen often.
I also don’t sit down to listen straight after I finish work for the day (I work from home); I let the working day melt away and decompress somewhat before listening, or again, I find it impacts my listening negatively