>>941992733 (OP)
Eh, I don't buy the better sleep one. Endorphins is a duh no shit one. Not sure if it lowers stress - especially if trying to not get caught - that raises stress.
Death grip definitely is a thing though, so if you are a 30sec chump it can help deaden the penis for real sex to help your partner. BUT it can also kill your penis's sensitivity for real sex such that you NEVER get off to real sex, but that only has a downside for you - the woman gets multiple orgasms for the few hours it takes for you to wear out.
Anyway, doing NoFap for NNN is a good thing if you think you are a porn addict or whatever, if you can make it a month that proves you definitely aren't addicted. It's a good break and lets your dick repair itself from constant masturbation too. Just as fasting is good for the body, doing a bit of fap fasting is good for you too.