The Hesse Axiom of Sleep Deprivation

First, let us define axiom. According to wikipedia:
"An axiom or postulate is a proposition that is not proven or demonstrated but considered to be either self-evident, or subject to necessary decision. That is to say, an axiom is a logical statement that is assumed to be true."

So, therefore, I will provide the Hesse Axiom of Sleep Deprivation which I developed after the birth of our first child:

If you can taste the toothpaste used to brush your teeth before you go to bed when you wake up, you are sleep-deprived.