[m463]

I notice it when I've stayed awake too long, and am exhausted. So I agree.

[masklinn]

Meh. I notice it most when the insomnia is acting up and I lay in bed waiting for sleep which doesn't want to come.

[lilSebastian]

I can relate, it's just awful.

[ozborn]

That's how it started for me, now it is constant. I'd look into high frequency hearing loss if it becomes more persistent.