Time of Day for best Sound

I've always felt my system sounded best at night, but the last couple months, it seems to me that my system is sounding better during the daytime even on a Saturday.

Has anyone belonging to the "My system sounds better certain times of the day" club noticed this change?

Not a big deal but I find it curious. And theres no need to debate the reality of the general idea, just wondering if someone else feels this has happened.

For the record I have been using a dedicated 20 Amp feed.