Roosters seem unreliable, and someone has to be reliable enough to ring the church bells if they were around.
See this thread; similar/ question was asked about 6mo or so if you search 'alarm' in this sub: https://www.reddit.com/r/AskHistorians/comments/rqujgu/how_did_people_wake_up_on_time_prior_to_electric/?utm_medium=android_app&utm_source=share
Or this FAQ thread reference: https://www.reddit.com/r/AskHistorians/comments/iit75g/theres_an_faq_on_how_did_people_wake_up_before/?utm_medium=android_app&utm_source=share