Does this seem like a natural way of speaking: "I am grated when ever it is twelve of the clock and I can not fall on sleep."? If you want an example lesson in language drift, go to Rome and try and talk to people in Latin.

"Wanna" is called a "contraction" or "slang", probably originating from "want to" and "want a" both pronounced like "want'ta". (For example, I am from Sacramento, which is often pronounced as "Sacra-minnow". Also see "shoulda woulda coulda".) Quite common in Northern California at least. Its probably best described as Internet English. The real question is: Does it make it harder to understand? Does it obstruct the goal of communicating information? Or do you normally speak like a 17th Century aristocrat, using archaic words that very few understand, but are probably technically on point? (Sorry, that are veritably apposite.)