laziness while not fapping

I also relate to this pattern, I feel really lazy and unproductive during nofap, although I dedicate more time. I guess the reason is low levels of dopamine and others can drive you down when doing solitary tasks and your brain is less receptive which affects cognitive skills and also push you away from social activities.
But this happens only at some periods of your recovery, in the long-run, let's say, a month, I can find I've achieved more things, going slowly, instead of sudden productiveness after pmo, and then extreme laziness which leads inevitably to more porn and get caught in the vicious cycle.
Being more aware now, I try to find pleasure eating well and running wen I'm feeling that way, as a reward from working and abstaining from pmo, and give some time for my brain to regain focus.

 

Maybe your nutrition is what is the root cause of this problem. Just my opinion.

 

Right, I relate to this. This made me relapse once or twice, I don't recall.
I arrived one day extremely tired and PMO was the only thing that made me wake up, now the thing is. I did keep at Nofap as a relapse is just a temporary sabotage.
If you keep sticking to it, I'd place my bets on that the tired periods will disappear, and you should also check your nutrition as mentioned above.