System sounds better at night?


I have noticed that my system sounds MUCH better at night, after about 10pm than at any other time of day. It is clearer, more open and transparent, with a blacker background. Another audiophile told me that this is not real, it's just that there is less noise in the household at night. I disagree in that what I hear (or don't hear) is not simply due to less ambient noise but rather cleaner sound. Will power line conditioners simulate these effects during the day? Has anyone else noticed this and what is the most effective way to get better sound during the daytime? Serious responses only, please.
jc4659
My system alway's sound's better to me at 3:00 or 4:00am, too think I thought it was the case of beer I drank and all the women that were coming over from the bar! Well that still might be some of it!
Mine also sounds better at night. At night people are in bed sleeping so you have fewer electricity poluting things on line. I found that as I go around turning things off for the night my system gets quieter.

Your neighbors polute your electricity. Things like fluorescent lights, TVs, dimmer swithches. These things and many more put garbage in the electrical system which shows up in the background of your system.
late at night when all the irritations have ebbed, one is relaxed, frostie or warm red, the ambience plays a big roll as one usually listens at a lower volume with a touch more bass.my system sounds incredible when i am the only one up.Mains power is always spot on where i live,another point is all the electrical things like fl globes are off...its not in the mind..its real.Music soothes the soul.

It could also be the giant EMI emitter is on the other side of the world  ;) 
No solar flare or sunspot activity at night, much reduced seismic vibration due to automobiles, buses, subways, less cell phone activity.