good listening/bad listening

My system sounds better at night when the lights are just right. It doesn't sound as good when bright sunlight is coming thru the windows. My wife and I both agree on this phenomenom. We know it's not "true" but it's real to us. This is why I suspect that many tweaks and upgrades don't really improve the sound but we think they do and therefore may be worth it. Humans are weird. Audiophiles are weirder still.

Guys saying that it might have something to do with your emotional state at that particular moment. Due to the higher stress level it might just not be enough to overcome our desire to distance ourself from difficult situation.
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Night time might also have something to do with it.
I am not sure if it has anything to do with the power but I also enjoy it more offten during late hours.

I think the power grid is quieter at night as is other interfence--such as road noise. Road noise you may not hear directly but the vibrations through the road--particularly if you are not too far from a highway is pretty amazing. So night listening being superior is something I would guess most of us experience--I do.