Not to discourage further discussion, but there is a section of the FAQ on this subject with relevant answers from u/yodatsracist and u/frogbrooks.

There's always room for more to be said, but I also have written a past answer that may be of interest to you:

Before there were alarm clocks; how did people made sure to wake up on time in the mornings, specially in places where maybe not every household had roosters?