Found in 1 comment on Hacker News
Spellman · 2017-01-30 · Original thread
Michael Breus has a theory that different individuals tend to sleep/wake at different points in the day naturally.

So perhaps your natural rhythm is very late night bedtime and late morning wake time? Does make life in the standard 8-5 world difficult unfortunately.

EDIT: non-affiliate link to his book The Power of When https://www.amazon.com/Power-When-Discover-Chronotype-Lunch/...

Fresh book recommendations delivered straight to your inbox every Thursday.