One thing I am fairly sure about, the amount of caffeine makes a difference to my sleep quality. If I have a single cup of coffee in the morning, no more, then my sleep quality seems not to be impacted. If I have several cups of coffee, only in the morning, I feel great for the morning, very stimulated, but my sleep is impacted. I wake up with a buzzing several times a night and have never been able to understand what is causing the buzzing.
>have never been able to understand what is causing the buzzing
Most likely it's the leftover caffeine still in your system that's beyond your personal threshold for quality sleep.
I have the same issue. If I drink two double espressos very early in the morning and then no more after that for the rest of the day, I have no problem falling asleep at night but I keep waking up several times during the night with a buzz, while my gf can drink 3 coffees per day and an espresso after dinner and still sleep.
The only way to get rid of this is reduce my caffeine intake to absolute zero, which is hard when you get the smell and taste of fresh single origin beans. I guess some people are just that much more sensitive to it than others, genetics be dammed. I wish there was a cheap way to measure the caffeine content in the coffees I make so I can precisely determine my personal threshold.
One thing I am fairly sure about, the amount of caffeine makes a difference to my sleep quality. If I have a single cup of coffee in the morning, no more, then my sleep quality seems not to be impacted. If I have several cups of coffee, only in the morning, I feel great for the morning, very stimulated, but my sleep is impacted. I wake up with a buzzing several times a night and have never been able to understand what is causing the buzzing.