What did people do to wake up on time before the invention of alarms or alarm clocks?

by lodgecal
jschooltiger

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Takemeuptomonto

In Victorian Britain and Ireland, 'knocker-uppers' knocked on windows with a long stick to wake up factory workers. This continued well into living memory. Here are a couple of primary sources from the 1940s showing knocker-uppers doing their rounds: http://www.yorkshirefilmarchive.com/film/parkers-mill-bingley https://vimeo.com/album/3066233/video/108109027