Caffeine

Is there an opposite to caffeine? If so, I wish I could figure out what it is because I swear that my brain can store it and dose me up on days when I haven’t even had any.  Alcohol maybe?  I really don’t drink.  I was on a school bus recently with a group of drunken young adults who were singing the same line from a song over and over and over.  Brilliant I tell you. 😂 Oh well, they were having fun.  Fun is important.