It is generally not recommended to sleep in earplugs, as you're risking inducing a tinnitus. Basically everyone has some background noise in his ears/head, but it is ordinarily discarded (not brought to consciousness) by central nerve system as it's much quieter than external sounds - but if you cut them out, you're risking that your brain becomes aware of that sound and bam - suddenly you have tinnitus. And it may very well stay with you for the rest of your life.
Out of curiosity, do you have a source for this? I developed tinnitus last year and currently do wear earplugs while sleeping, however I certainly don't want to make it worse.
It seems to be the first therapy for tinnitus which was confirmed in clinical trials. Unlike TRT, it can actually make the sound go away and not just make you less unhappy about it.
