I was woke from my sleep by my wife she asked me what is that noise. All i could hear was a deep tone hum, so i looked out of the bedroom window to see what was making the noise and could not see anything, so I opened the window to get a better look. The hum was still continuing just one long tone. I was leaning out the window to get a better look the road was quiet (being a dead end no through traffic ) all I could hear was the Hum no other sounds not even bird song that we can usually at that time of morning. By now the Hum had been going on for 15 to 20 minuets. Not sure if was the Hum or just that I was still half a sleep but it was getting difficult to think or focus my thoughts. Then there was 3 bright white flashes as if someone had set a camera flash off in my face 3 times in a row with only a second between each flash, as soon as the 3rd flash happened the Hum just stopped and then i could hear bird song and the sound of light traffic in the distance but no moving cars in my road or other roads close by. Went back to bed with a mild headache.