Sleeping with ear plugs can be a dangerous experience. I used them. Not anymore. Recently one of these ear plugs caused me acute external otitis during my sleep. I didn't understand my symptoms immediately and thought I'd permanently lost my hearing. I woke up with the ear canal swell shut.
I completely freaked out! I knew that hearing was a crucial part of my life. I didn't imagine how crucial it was... This predicament was the single most traumatic event I ever experienced to this date.
Fortunately I was cured but there was a dramatic and valuable lesson to be learned.