I know that relating to time of the day like 'nat' or 'morgen' you're supposed to use 'om'. Apparently - but I'm not sure - for weekdays you use 'i'. And i'm not sure when to use 'på' either
Why "om natten" and not "i natten" given that the prior question gave "han arbejder i hverdagene" as the correct answer and not "om hverdagene"? I understand that repeated events in time requie the use of om and not i, but this rule seems inconsistent with saying "arbejder i hverdagene"?
It seems that when refering to times of the day it is used "om", while when refering to weekdays is "i". But I am not completely sure, since the Tip section did not mention a case like the preposition for weekdays