Male. Southeast United Kingdom. Mid 40s in age. I recently moved from one side of the town in which I live to the other, and I now hear the HUM. It comes on only at night when I am in bed trying to sleep and it is driving me almost to tears with its persistence. At first, like many others who I have read about online, I attributed it to a nearby truck idling its engine at the nearby industrial complex overnight for heating in the cab, but after reading this and other aritcles I now believe it to be the HUM. I have actually considered moving back across to the other side of town to get away from any industry in the hopes that this will help.

I lived in the San Diego, CA area for 15 years, and never heard the HUM there, but now that I am back in my home town in the UK I hear it 3-4 nights per week no matter the weather conditions. Opening the window helps as it introduces outside noises which cancel out the HUM frequency, but when it's below freezing overnight it's not practical to have the window open.

I have found articles going back as far as 1994, and other references to reports going back to the 1970s, so my question is this. Is it possible to avoid the HUM all together and escape it, or am I doomed to sleepless nights for the rest of my life no matter where I move to?

Does a cancelling frequency from a speaker such as a tablet device or mobile phone help?