For me, caffeine aids sleep. I find it much easier to make myself stop excessively thinking about things when I am caffeinated. However, if I have caffeine too

For me, caffeine aids sleep. I find it much easier to make myself stop excessively thinking about things when I am caffeinated. However, if I have caffeine too early in the day, it makes it harder to clear my mind and sleep that night than if I had no caffeine at all. For this reason, I aim to only have caffeine after 3pm (preferably later, depending on when I plan to go to bed).