Hi. Trust me it is not about being relaxed at mind. I sometimes come back home pretty late from the Airport evening shift job and switch my Hi Fi when making dinner. I can swear now ,and funnily enough also after a few-hour-earlier-suggestions, that it could be about electric pollution. Everything proves this. Every night no matter how tired or relaxed I am and if I stay late of course ( it is not that I am listening to music late every night ) the sound was much better. In the mornings or around noon - a setback like hell. There must have been something. Another proof in pudding can be that very often I am using a small bluetooth speaker that I connect with Spotify especially when falling asleep and listening to new albums when my other half allows
The same speaker no matter what day and time it is - it sounds exactly the same ! I could never ever notice any sound changes coming from it. Only from my Hi Fi. And each Hi Fi that I previously had. It might be that some systems are wrongly connected like mine was whereas some from you have decent sockets and this problem is almost non existent. But I am now 99% certain that each amp should and can be enormously improved by direct plugging to the mains. And at the same - the sound. I really could not believe a few hours ago when I tested it...