Doing this just makes me want to go back to sleep again.
I've read medical reports that a man's testosterone level, and his sex urge, are highest when he awakes in the morning. Not at night, when we commonly think guys most want sex.
Well, we do wake up with morning wood. As for falling back to sleep, I experienced that in the extreme when I was a teenager.
I'd get so sleepy after jacking that I'd almost instantly fall asleep in my bed, even in the afternoon. I don't know if it was similar to the French term "le petit mort" ( the little death). Although I think that's more like fainting, and women more typically experience it.
But at least one time I went right to sleep, still holding my hard-on, undressed & uncovered. My Mother barged into my bedroom with me like that. I think I was 14.
The sound of the door opening jolted me awake, but it was too late. I quickly let go of my now semi-hard dick and pulled up the sheets, but it was too late. I saw the startled look on her face, and she turned and bolted back out the door without saying a word, closing it.
She later never said anything to me about it. Nor did she send Dad to have a "talk" with me. My parents were very permissive with me.
Moral: if you have a tendency to get quickly drowsy after jerking-off, do take precautions as circumstances warrant.