There is what’s right practical and then there is what’s right to keep the the itsie bitsie brain worms from eating away at your pleasure center. My advice based on you OP is leave it on. Excessive heat is what kills electronics soooo. add cooling fans as needed to the hot parts as needed. Usb powered lap top coolers work great! Get a "Watt Power Meter Plug Home Electrical Usage Monitor" to see how much juice your amp uses over night (Less that $15 on amazon). This will kill that brain worm. Benefit will be you now will have an on/off switch that will last forever (a whole other topic of conjecture) .
Enjoy the music and as Van the Man says - "turn it up, little bit higher radio
Turn it up, that’s enough, so you know it’s got soul
Radio, radio turn it up, hmm La, la, la, la, la, la, la ...........