It’s normal, I call it the “brain pump”, it’s pretty cool (though it goes away with plasma and HGF)
It is normal after listening to brain fields, but I wonder if ISIRB-RBM3 cause that even more than the others…
Anyway, you can use some energy fields like unlimited energy tag or Hypersleep state, but you’ll still be below your maximum potential to study, think, learn. Think of an athlete resting before the big game.
Personally I give myself a two day break from superhuman genius and brain growth work. You can use the neurotransmitters, gamma brainwave and willpower for learning. Also the M-state album and some other less invasive fields
Edit: Sorry if it’s out of topic,