What typically leads to a good or bad day with your stutter?

What typically leads to a good or bad day with your stutter? A lot of stutterers say they have good days and bad days. Some people say it's random and they can't explain why some days are better than others. But most agree that sleep deprivation and stress make their stutter worse. Are there any other factors you've observed that contribute to you having a good day or a bad day?