Now explain Spain which is an Atlantic/Mediterranean melting pot: Iberians/Aquitanians/Celts/Tartessians/Phoenicians/Romans/Goths/Franks/Occitans/Suevians/Beribers, and who knows how many Ethnics/tribes/peoples.

And then you have both microclimates/microcultures everywhere because you will find mountain and valleyss in less than 100kms near around. What kind of genetics do raise here? You have the infamous 'sleep illness' located in the North of Spain around the Cantabrian Sea regions:

https://en.m.wikipedia.org/wiki/Fatal_insomnia