I’m hoping you may be able to help me also. Based on your response to @lif I removed the default schedule which helped with making sure my screen brightens at the correct time. I also tried to add in later times for the weekend when my family tends to sleep in, but it is still brightening at the weekday times. I’ve included my config below. Of note, the default times in the MMM-AutoDimmer.js file have been set to match my Saturday and Sunday times and the screen is still brightening too early.

module: 'MMM-AutoDimmer',
position: 'fullscreen_above',
header: '',
// Don't change anything above this line
config: {
  schedules: [
      {
      days: ["Sunday","Saturday"],
      dimTime:2000,
      brightTime:700
            },
    {
      days: ["Monday","Tuesday","Wednesday","Thursday","Friday"],
      dimTime: 1930,
      brightTime: 0530
      // defaults are used for values that are not explicitly set
      }