AnomalySimilar to an electrical motor whine mixed with a distant car engine sound In trying to find source of the sound I've had hearing tests, electricians check the wiring, plumbers check central heating in neighbours houses in case there was a noise bleed and made initial contact with Environmental Health Noise Control. There is no explanation as to why it suddenly started early in January or indication of a cause.
UK, Sleaford · 2018-04-17 · from the WORLDHUMMAP archive
An account in UK, Sleaford
What they reported
First noticed: 2018
Pitch: 400 hertz
Loudest: During the night
Where: Indoors
Symptoms: Headache, Insomnia, Sense of vibration
Changes with weather: Not noticeably, although it seemed much louder when it snowed because most outside sounds were muffled
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This is a Hum report from Dr Glen MacPherson's World Hum Map, an open, worldwide record of people who hear an unexplained low-frequency hum. Reproduced with permission and with thanks; the project is at thehum.info. We remove anything on request. Location shown is approximate.