As a kid, I used to have this problem where I'd get super excited whenever I was promised anything. I call it a problem because back then, it used to make me impatient, and some days I would find myself unable to sleep or do anything properly just because I'm too excited and can't wait for that thing (whatever it is I'm promised) to happen or be given to me.
I noticed it was an issue from a very early age because I hated the feeling of being impatient, but I hated the fact that I couldn't control it even more. So back then, what I would do is try to distract myself with anything I could do, just to get my mind off it and be able to focus on other things.
That barely worked at the time because whatever it was would refuse to leave my mind, and at the time, the only way I felt I could handle that situation was probably just to have a temporary amnesia until that day (the day I'm to get the stuff) comes.
Fortunately for me, though, as I got older, I began to get some sort of control over it. And although the majority of the reason for that was growth, another reason was because I was starting to get nonchalant about most things. Because, like I said, I found out that the less I cared about certain things, the less excited I was about those things.
And although that worked like magic, the downside to it was that I really began not being interested in certain stuff, and this wasn't because I didn't want to get excited about them, but because I was genuinely no longer caring anymore.
So I had to stop that method and just go back to the forgetting about the stuff until it arrives method, and although I don't forget entirely, I've found a way to push those things to the back of my mind where it doesn't affect the way I do other stuff and also doesn't make me impatient like I was when I was a kid.
But to be completely honest, there are still days when I find myself still being impatient and unable to have a proper good night's rest because something huge is about to happen the next day. Hopefully I learn to get a handle on it and be able to control my emotions a lot better than it is now.