It's not easy to sleep on SQ32 anyway since it's a morning departure. It is the shorter of the two journeys, and the Polaris lounge at SFO is superior to the SilverKris lounge at Changi in my opinion, so you have a better deal than doing PE and J the other way around. PE is not as good as J, obviously, but it won't be the end of the world. And you can use it as motivation for your kids to study hard so they get a well-paid job and can always fly in J