i run 16/8 with auto and it work fine (check my purple kush CBD auto), i also once had an auto mixed with my photoperiod and so on runned it 12/12 and it also growed well (check my Hazeberry).
My concern is similar as yours i need to sleep, i have the extractor off at night cause it make too much noise to fall asleep well, that's why i run 16/8 with auto
if you want to know more about day/night cycle search for "circadian rythm for plant" with google