DH and I both agree, somewhere in the block of houses there is a giant snoring. There is this sort of low, grumbling, rumbling sound heard distantly for a few seconds, then a pause, then another low rumble, then another pause. The snoring giant is the only thing that makes sense.
Actually I wish it was something that interesting. In reality I am torn between one of the neighbours having a new tumble dryer near the pipes or Nice Mr Next Door having something mechanical going on.
Which reminds me that it is time to read 'The Selfish Giant' to bear again. It is a real favourite of mine and it is a great time of year to revisit it.