Can a human change from a predominantly diurnal sleep pattern to a more nocturnal one?
Oh yes. Even if humans are predominantly diurnal, one can become nocturnal over time. It’s a lot like how books detail how to change a hamster from nocturnal to diurnal. (NO I’M NOT SAYING PEOPLE ARE HAMSTERS) You simply change the times at which you recieve light gradually. Make it about ten minutes later each night, and your body will start to shift with it. However, I warn you that you will not lead a normal life. You will lose contact with others. Being asleep while everyone is awake will separate you from 90% of the human population in your area. (I say ‘your area’ as I don’t want a dumbass saying ‘OHHH but what about in Australia or China?!?!?’) You can still do grocery shopping, but movie theaters, malls, libraries, many stores, schools, most careers, and the majority of places will no longer be an option at all.
