I really think a large portion of the loudness of my T (not all of it however) is based on glutamate and gaba neurotransmission. The reason I believe this is because of medication I have taken that affects glutamate or gaba can have an effect on my T (though not all the time and I am not sure why). Does anyone know if these neurons or chemicals in the brain change during sleep? T seems to be louder after waking up. At first I thought maybe it was me grinding my teeth or the maybe some kind of blood circulation issue but it can't be because I took a very short nap the other day while sitting up and my T was louder (more static). I know I did not grind my teeth.