I know what you mean. We really struggled with the flights to and from Japan last year and we were flying business class. Mind you we had two short overnight flights, Singapore - Haneda and Singapore - Sydney, both too short to get any decent sleep especially with the weird angles of the seats in flat mode. I think I preferred the older style seats. They may not have reclined fully flat but at least you were lying straight instead of like a pretzel!
We're hoping we have one more overseas trip left in us as we want to go to Europe in 2025. If we do I shall make sure we don't have any short overnight flights even if it means transiting in the Middle East or stopping over somewhere for the night.