Inspired by Nathaneal Boehm I’ve been thinking about about implementing an alerting system that gradually gets louder. There are multiple dials to turn up, I suppose alerts could come more frequently, become larger, bolder and with a brighter and brighter background.
This would work if you’re asking for a specific action to be taken. And of course it can definitely be abused so hopefully the action is something beneficial to the user as well. If UX were a personal trainer, this would be one of the tools I’d use to get my users to exercise more.