Dry curly leaves, some with brown or yellowing spots

Some of them are a week before harvest and my room seems to have been almost takin over by something that's making them dry, curly, brown and yellow. They seem to be curling in every direction. At first I thought bugs may have been the issue so I started spraying neem every other day but the problem now seems elsewhere. I've flushed with water twice since I've noticed the problem. First time indoor gardener needs seem help

Could use some info, feeding schedule, air temp, lighting, have fans creating air circulation?

Firstly dude, one major thing is check can u use Neem 1 week before u intend to harvest?? I'm not into my pesticides thankfully but if u haven't checked already, do definitely find out if its safe to smoke spraying that close to harvest. (and like i say, apologies if u already checked & i'm being a paranoid loon!)

Otherwise, i can't give u much answer sadly as it does look strange from ur pics - there's alot of flushed dark green new foliage that looks fine but also alot of them look almost overly glossy & abit hairless too, which seems odd. With my limited experience of problems, my educated guess would be something its ingested or a diease/infection - it almost looks like parts of it are rotting & dying.

My only one tip would be, if u can, slide the pot quickly off the bottom of one would be good idea to see what roots look like or if any sign of moulds, slimes, insects, etc down there. Tho i must say, i'd be surprised if it is insect damage as seems unusual symptoms.

best of luck man