The time of year that you're born can have an effect on how optimistic or depressed a baby is. The relative age people are very curious about, and i'm guessing many people listening the show have heard some version of it. I would be surprised if any of these effects were huge. There's so many other things that would swamp the effect of six hour daylight day versus eight hour daylight day.
Also: how did Angela do with her no-sugar challenge?