If you happen to be flying in PE, the second meal is served about 2.5 hours before landing, with snacks available in the middle. I actually preferred this timing to the J meal service, where I was blissfully in the middle of REM sleep before being awaken by the noise from the midflight meal service. I was not able to fall asleep again at all after that, and who really needs two full multi-course meals within 6 hours of each other while sitting/laying down on a plane??

Sleeping 6-8+ hours straight in PE is impossible for me, regardless of how much alcohol I have consumed (and good luck getting anything beyond wine in PE on SQ). But I could have easily slept for 8+ hours on the lie-flat bed (which I found to be quite comfortable on my one trip in J on this flight).