In this case, I think Cecil’s answer of “What causes ringing in your ears?”, was a slightly different question than was being asked. The question was about “that tiny pitch you may hear in one ear that temporarily blocks out sound” (my italics and bolding). However, Cecil’s answer was about standard tinnitus.
What the question was asking about is something maybe everyone doesn’t get. Standard tinnitus is fairly steady and longterm, and, at least in my experience, usually affects both ears, plus it doesn’t muffle your hearing. What the question is asking about is a sudden onset of a high-pitched tone, only in one ear, which muffles the hearing in that ear, but quickly fades away in about ten seconds.
Actually, it seems like chronic tinnitus goes with hearing loss. I have both the continuous buzz (which sometimes I don’t notice, or don’t have) and the occasional minute-long (or I guess, more like 20-second) louder buzz.
First, the serious part. I have had tinnitus for several years, accompanied by a slight hearing loss in the higher frequencies. Fortunately, I have come to accept the ringing. It doesn’t keep me awake. The hearing loss is an inconvenience sometimes. Most human speech is in the midranges that I can still hear, but a conversation with a high-voiced, quiet person is perplexing. Protect your hearing, folks!
Now, for the other part… Rock musicians often have tinnitus, due to the high onstage noise levels. For them, sleeping with a fan usually doesn’t help them get to sleep. The little sweethearts don’t really want to sleep.