I have recently bought a new pair of sleepphones and love them so much, I have never slept or woken up better. I have even started using them for general use since the wireless option is so convenient.

Now my parent has told me that I should stop using them because they cause brain cancer and doesn't like the idea of them being near my head.
I had previously done a bit of research and thought it should be safe, now I am not so sure and am scared to use them again.

I am using them more than 8 hours a night for binaural beats/white noise/musical alarm + general use.

Is it safe?