Yeah I remember having to tell my doctor that too initially lol. Turns out only getting 5-6 hours of sleep at actual night means you want more sleep in the afternoon.
Get your solid 7-10 depending on what you need from genetics and that afternoon nap is much less needed. It's good right now since the gf can sleep with the kids when they're down for their naps too. But she's perpetually surprised that only going to bed between 12-1am doesn't exactly leave you feeling refreshed when kids get up between 6:30 and 7 lol.