Sleep, and carbohydrate consumption have a big impact on insulin.
The average person "eats" 6 times per day (3 meals, and snacks/drinks). Each one of those food boluses has carbohydrates (chips, coke, energy drinks, most "coffee", trail mix, donuts, etc). It takes 2-4 hours to get blood glucose back to normal for a healthy person (more if metabolically unwell). When blood glucose is elevated insulin is elevated, i.e. out of balance. 6 glucose events per day * 2-4 hours per event : 12-24 hours per day (probably 18) are spent with elevated insulin levels. The only time the average westerner has normal insulin levels is when they sleep.
Any increase in time with normal insulin will have a benefit for health. Keeping the sugar/carbohydrates to one meal per day (but still having zero-carb snacks/meals for the rest of the day) would be a great place to start.
You might also hear this called glucose metabolism vs fat metabolism. You want your body to mostly be in a fat based metabolism