I find this schedule to be the best. As Aussienarelle said, when you arrive it's almost the 'natural' time to sleep. And as always: lots of water, not much alcohol. In general, I find that it is easier to adapt when traveling west, rather than east. So I find that the return trip is the more challenging.
I also recommend wearing compressing hose (up to the knee) to combat bloated legs. or worse: DVT (Deep Vein Thrombosis). I managed to have a DVT on my last trip home. Had a window in Econ+ and I did not get up enough to stretch and promote circulation. As a very experienced traveler, it made me feel like an idiot.
Enjoy Singapore. Food recommendation: Song Fa. A pork rib soup speciality. There are several locations.
And I think you can still watch Crazy Rich Asians on the flight.