I’ve always wondered - do we know what is actually the cause of this?
I’ve had this happen before in similar circumstances as the post but way less severe, and I always figured it was because the brain’s “processing speed” increased, allowing it to process a bigger quantity of information per unit of time, but I don’t think that would make sense given that entering this state usually needs you to be hella tired?
can confirm that it’s a constant sine wave, at least for me.
i blew myself up by accident a month ago, and while my left ear has fully recovered my right one wasn’t so lucky. lost all hearing above like 10kHz (which isnt really noticeable, especially with my left ear still being good on frequencies), and i also now have some very minor tinnitus there. ironically if i had to guesstimate the frequency of my tinnitus it would be around 12 kHz, which is past my hearing range, though it can change briefly because of external stimuli.