"Brian Gaff" wrote in message
...
There is a peculiar noise. IE its one of those very quiet intermittent
whirring noises that you can only hear when its quiet at night, and once
you know its there, you find it wakes you up.
The problem is that its seemingly everywhere and nowhere in that its no
louder wherever you go except in the upstairs front rooms.
My suspicion is that it is part of next doors central heating that is
somehow transmitting the sound through the building, but she can hear
nothing she says.
Any tricks other than asking her to turn it off and on again, which might
well not go down too well?
Do others have noises? Add to this of course that you don't it when
normal sounds are there in the day.
Brian

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From the Sofa of Brian Gaff Reply address is active

How long has it been going on?
Do you get it in summer? If only Winter then possibly to do with heating.
Could be fan in boiler as well as circ. pump.

Possibly related to water (tank filling?)
Washing machine.

Choke in fluorescent light.

Rodents in roof space chewing/gnawing?
This is one we get from time to time.
This is a winter one too come to think. And they are more active at night.
I think this latter is quite likely.