If he's falling asleep after sex....

If he's falling asleep right after sex, the questions are...

Did he make significant eye contact before nodding out? And what did his gaze say?

Did he just pass out, ignorant of all, or go to sleep happy to be with you?

Why are you so hyper-awake and chatty, post coitus? You shouldn't be. Do "it" correctly. Trigger those contented, chilling out endorphins. Now, relax and sleep, too.