Hello,
where was that topic about tuning effect on brains.. ? i just can't find it.

Sorry, I do not know what you are talking about. Perhaps you meant tuning and hearing impairment?

However, this topic definitely evokes a Jerry Groot moment!

Google for "piano tuners and taxi drivers" and see:
http://www.bbc.co.uk/news/health-19398413

If you are referring to the "spatial" mapping function enhancement due to engaging in tempering pianos or visualizing traffic routes I don't think that qualifies as ("nerv) damage".

One thing I can suggest you if you can do it : shut down your wifi modem before going to sleep. I feel the shut down of those as when you have a light headeache and it is gone you did not notice it really untill it stops.

So to have a better sleep it is better to shut all radio tranmitters.

Experients made on rats sleep show the sleep is disturbed even with minimal exposure. Sorry for the OT