Someone needs to get the bright idea of an app that is a notes app designed to function like a messaging app.
You can “message yourself” immediately or set a time delay so that the message comes in after a given amount of time, or at a certain time, or under certain conditions. You can tell messages to repeat until you finally address the contents.
An extra-sinister idea would be an option to set messages to come in like a phone call. Make a message titled BOSS that repeated every morning. That’ll get you up.