For me, things always sound better at night. I heard once that there is less electricity used at night time. No big corporations sucking all the power. Which would explain better sound at night. I definitely agree with moods. My system does change depending on how I feel.
Sound quality vs. Mood
I've been trying to get a handle on why my system sounds so much better some times than others. The most common explanation would probably implicate the quality of my power. That could very well be and as soon as I can afford to experiment, that's what I'm going to focus on. However, I've always suspected that mood has a huge effect - maybe the largest effect - on subjective sound quality. Any thoughts?