Did you hear about the dyslexic agnostic insomniac?

Did you hear about the dyslexic agnostic insomniac?
He stayed up all night wondering if there really was a dog.


This is a joke based on the definition of words. I is also a joke that makes fun of people with disabilities. It is absurd as well

Hopefully everyone already knows the definitions of all of those 3 and 4 syllable words, but just in case:
a dyslexic is someone that mixes up spellings of words and has a hard time reading.
an agnostic is someone that thinks that you can't know about the existence of God.
an insomniac is someone that can't fall asleep easily.

So, the combination of all those three things would be someone that stays up all night, and also someone that perhaps wonders if there is a God, but it gets the definition of dyslexic wrong because the joke assumes that a dyslexic person also thinks in the mixed up spellings that they might write, and therefore would confuse a dog with God.

The humor lies in the fact that the jokester messes up one of the definitions, and also in the absurdity of someone staying up and wondering about the existence of dogs.