This may not apply to everyone here, but I've realized that since my emotions are always in the extremes, it's pretty easy to appreciate those simple and calm moments that others might take for granted. Like when you're content with the weather or you got to spend the day with your sibling. You had a successful grocery run or you're caught up in school work.
 
I can't even appreciate my happy moments anymore, because I can feel myself getting way too excited and I can't do anything about it. Then I know that things will go back to being really bad again eventually (probably even that night). It's because of this that I can really appreciate it when a day is just mediocre. 