Saw this come up on my feed yesterday and honestly it ticked every box. Three hours is significant - that's not a little nap or losing track of time doing chores.
John Mack died in 2004 but his work is still cited. Harvard might have people interested in the subject but I'm not aware of an active formal department.
Could've been a trick of the lights? The Tube can play funny games with your perception when you're tired. Flickering fluorescents, reflections, that sort of thing.
Have you tried frequency analysis? Using spectrograms to identify anomalies rather than just listening. Digital analysis removes the human pattern-matching element.
The best night vision setup for this kind of fieldwork without spending absolutely silly money is probably the Sionyx Aurora - you can pick one up for around £400 and the low-light performance is...
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