Web alarm clock for 5:29 a.m.
Before handing the chore over, tell the next person that the rubbish bags need to be outside for the morning collection. An alarm set for 5:29 am gives them a clear cue to get up, check that every bag is tied, and carry everything to the collection point before 6:00 am. That handover also prevents each person from assuming the other will handle it.
For this rubbish run, check where the alarm sound will play before you leave the phone beside the bed. Audio can quietly remain routed to wireless earphones, so the person taking over may never hear the alert. Set a distinct volume, disconnect unused earphones, and test the sound once. Keep a separate backup for the rubbish collection: the browser alarm cannot signal if its page is closed or the phone goes to sleep.
While passing along the early-morning rubbish duty, leave the phone where the time can be checked without staring into a bright display. At 5:29 am, a dim screen and dark theme reduce harsh contrast in an unlit room. Lower the brightness before settling down, then place the phone within reach but away from your face, with the alarm controls already visible for the person taking over.