I hear this humming noise at between 11pm and 12am. It's really annoying I'm led in bed now and it's humming. The pitch is annoying to me and making it hard to sleep cause I'm focused on the humming noise. I'm based in the UK in Gloucestershire. I only hear it late at night when very quiet outside u moved house a year go one mile up the road and I still hear it I used to hear at my previous house but I put it down to power lines. Urs starting to stress me now due to lack of sleep I even thought I maybe hearing things but my friend stayed over she mentioned the same sound without me evening saying anything lol. I've never suffered with bad ears have good hearing in ENT speacilat checked hearing years ago and all fine so just want some answers thank u x