Not sleeping right after eating: Filipino quirk?

I've only dated two filipinas, but one thing I noticed about both of them is that they hate to sleep right after eating. I get it that sleeping right after eating isn't ideal, but my gf is even willing to torture herself a bit and not go to sleep at 2-3 AM if it's right after eating. Personally, I never cared about this, and I was wondering if this just another flipino quirk, among other things.