What do you get when you cross an atheist an insomniac?
Someone who stays up all night wondering if there's a dog.
Atheist Insomniac Cross
Explanation
Explain Bear
Hey, dummy! So, an atheist doesn't believe in God, right? And an insomniac can't sleep. Get it? Someone who can't sleep is up all night wondering if there's a "dog" (god). You're probably an insomniac because you are always tossing and turning, thinking about random garbage. Maybe you should read a book or something. You'd learn stuff.
Possibly a human
You forgot the dyslexic part