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Comment by masonic | Hacker News Reader

  It's probably in our genetics

It's never been reported in pre-industrial societies or even presently in areas where artificial light well into the night is uncommon.

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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-be...

DSPD is also seen far more frequently in adolescents.

That does not factor in genetic predisposition to sensitivity to the circadian stimulating effects of blue light.

Some people aren't much affected by screen time at night, and some people can readily get up before dawn. I for one have to be very careful to limit my exposure at night, and waking up before sunrise (artificial or natural) is excruciating. I have been diagnosed with DPSD. I vastly prefer to go to bed and wake up later than average

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