I've used an app called Wake Up Light for a while with my Lutron dimmers and HomeKit. You set up some basic parameters and it generates a series of automations

I've used an app called Wake Up Light for a while with my Lutron dimmers and HomeKit. You set up some basic parameters and it generates a series of automations that gradually dims the light up to a specified brightness at a specified time. It makes waking up easier for me when it's dark outside.