I think it's dopamine - you've been going about 6 days - I'd have forced myself to have slept for a few hours on a couple of occasions over six days.
It's either dopamine, or changes in related neurotransmitters/circuitry -- definitely feels like a physically-altered state of consciousness, if that makes any sense. Like the "dopamine focus" becoming so one-pointed that it blips out of of existence into no-pointedness.
I did get a couple of short sleeps -- don't really know how long they were, tho. Couple hours apiece, at best.
Provided you do sleep regularly, a few hours in every 48 hours, then you can keep the party going a while. Once you stop I find there's a significant crash a few days later.
Oh, there's gonna be a crash... no doubt about that here.
But I've done this before, fwiw... this is nowhere near record length.
Actually kinda surprised how "just fine" everything is, considering the length -- although things sometimes take sudden, drastic turns at this point. Sleep deprivation's the primary issue at this point, but it can combine very unpredictably with peevee/dopamine. Have had "sudden brain shutdowns" in the past, where everything goes south in a matter of minutes and it's lay down or fall down.
Do I kinda sound like a maniac to you, BTW? If so, I'd appreciate it if you'd tell my bag/vial, cuz they don't listen to me, they just tell me to sit down, shut up and they'll call if I'm required.
Then again, I bought them.
Let this be a lesson: Never buy a slave -- you're only buying yourself.
Peace...