That's ok, if you're trying coffee for the first time then it's more of a journey to find the perfect measurements for yourself.
For example...
I use instant cappuccino (4 tea spoons), sugar (3 tea spoons), a bit of water to mix it up, 4 ice cubs, then a tea spoon of cinnamon, and half a tea spoon of dark cocoa. Finally, filling my mug with milk, whiska bit so everything gets incorporated and done (o´▽`o)
I usually have this mostly to start my day comfy, but to be honest coffee doesn't wake me up neither makes me sleepy, but it does help me to focus and not drink it in one go.
According to some friends who have ADHD, coffee makes them sleepy because it works as some kind of self-medication to regulate adenosine in the brain. I don't know much about it but I recall a friend explaining that to me, I think there are more detailed experiences or explanations tho!