I have a very irregular schedule, I might go to sleep at seven in the evening, I might go to sleep at two in the morning.
I turn on “asleep” mode either just with a touchless switch on the nightstand or by voice with Alexa.
Some people use a pressure mat under the mattress to indicate when the bed is occupied or not.
There are people who use Tasker and trigger events when the phone is put on the charger.
some people who watch television every night before going to sleep trigger their good night routine when the television powers off after a certain time of day.
So there are many different ways to do it, just depending on the habits of your own household.
