There have been quite a few studies popping up recently regarding this and there does appear to be genetic mutations that account for being a "night owl". http

There have been quite a few studies popping up recently regarding this and there does appear to be genetic mutations that account for being a "night owl". https://blog.23andme.com/23andme-research/the-genetics-of-being-a-morning-person/ https://blog.23andme.com/23andme-research/the-genetics-of-be... DSPD is also seen far more frequently in adolescents.