I also use TENS/EMS on my tragus (second electrode ~C3-C4). With the right intensity/pattern (which varies time to time based on comfort), it wears me out and m

I also use TENS/EMS on my tragus (second electrode ~C3-C4). With the right intensity/pattern (which varies time to time based on comfort), it wears me out and makes me a little groggy after. Anecdotal evidence is what it is though. As a side note, I read somewhere that this should only be done on left side due to the right Vagal nerve possibly having more interaction with the heart. Nothing to cite other than a fair-warning of something relevant.