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My friend, who owns some very hi-tech recording equipment, has been recording sounds in his room while he has been asleep over the past week. He lives alone and in a remote location, so never really hears much activity at night. However, about 3 weeks ago he was woken up due to what he describes as a sort of deep resonating noise, which he took to be the call of animal of some sort. According to him this noise stopped as soon as he awoke. Intrigued by this he set up his recording equipment to record noises while he slept so as if it happened again he could try and work out what it was. Everymorning he would look at the recording in graphical form so as he could quickly spot any anomalies i.e. spikes in the waveform and zoom in to have a closer inspection. Over the first 3 days he recorded nothing, apart from himself making some grunts while he was asleep, then on the fourth day he came across this, and he has no clue what it might be, nor do I. Below is a copy of the anomaly that he found;