Hipper
Addicted to Fun and Learning
One night I slept with the headphones beside my head, it was plugged in with DAC, amp and PC turned on but without any music, I woke up having a tinnitus on the ears which was on the side of the headphones.
Surely it's down to this, leaving your gear on all night. PC's in particular seem to make noise, even the quiet ones.
If you want to experiment, place the gear on the other side of your head and go to sleep. Which side do you get tinnitus now?
What volume do you listen at. Listening too loud can cause problems, particularly long term damage.
I have HD800 and listen for two hour sessions at most and have never suffered any issues.