I am learning about impersonal constructions with 'es'. My textbook says that sometimes the 'es' is implied in such sentences:
Jetzt wird geschlafen
This is translated as 'it's time to go to sleep now'. However, I don't understand how this meaning is created. It's not intuitive for me.
Is 'Jetzt' the subject of the sentence? Would the non-passive construction be:
Es ist jetzt Zeit zu schlafen
Why is the passive construction not:
Es wird jetzt geschlafen