Does anyone know about EMF (Electro magnetic Fields)

We are having heart rhythm problems in our house.  Nothing extreme, but something we are looking for a root cause for.  I asked a health care worker who is into natural healing and she told me to turn off my wifi at night.  I don't really have much of an opinion about the whole idea.  I haven't done enough research to have one, but I have noticed a big difference since then.  It hasn't made any difference in heart rhythm that I have seen, but I have been sleeping an average of two hours longer at night.  That has given me pause.  Any thoughts?