I fully understand that some people are seemingly genetically predisposed to get up later, and in puberty this effect is exacerbated (puberty seems to cause peo

I fully understand that some people are seemingly genetically predisposed to get up later, and in puberty this effect is exacerbated (puberty seems to cause people's circadian rhythm to make them stay up later). I'm probably one of them, looking at my sleeping habits. So while this will obviously have a positive effect on 'night owls', may it have a negative effect on 'early birds'?