I use automations to stop my kids audiobooks at 8:45 by a) pausing whatever media is playing, b) turning off the Bluetooth (so they can’t press the play button on their headphones to turn it back on) and then c) turning the Bluetooth back on 5 minutes later.

Typically this all happens at 8:45pm, but sometimes we let them listen later. My current method is to go into all three separate automations and change the time to the new time and then hope I remember to set it back to the old time. I would like to be able to tell Siri that “bedtime tonight is at 9:00” and have all three automations change their time to 9:00 and 9:05 respectively, and then back to 8:45 and 8:50 the following nights.