Good Tired

Why are my Sir and I exhausted and rejuvenated after playing?

8. You’re Just Too Good In Bed To Not Be Exhausted 

And then, there’s always this possibility to be considered: You rock her world; she rocks yours and together, you’re rocking the bed, the table, the walls and the entire household. That’s got to explain your levels of exhaustion when all you want to do is lay like a vegetable and bask in the glory of your awesomeness as you laze around the place, going over the entire events of last night or early this morning. Phew! ~mensxp.com

That might explain it! It’s a “good tired” not stress tired.