Can self-awareness be proven?

René Descarte stated Cogito, ergo sum (I think, therefore I am). I don’t know about anybody else here, but I exist. And although I am 100% positive that I have consciousness, I don’t know of any way to prove it to you. Do you think that there is any scientific method that could point to consciousness and show that it is something that is material (e.g., by measuring brain waves, perhaps)? Is self-awarenessness something that is phenomenal and cannot be measured because, perhaps, it is without any material form? Could it be that cognizance is something that is preternatural outside of human beings? (I strongly doubt that last question.)
What do you think? (Or do you really think at all?)