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This doesn't happen in most countries. 
I've never seen this and I'm driving for over 20 years. 
Sounds wild. 
My advice is to slow down and let them drive away from you and do not approach or try to signal them. 
Just avoid.
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I can't speak for the ambulances but my father was a police officer and he said 95% of the time people driving without headlights at night were impaired >

I could see some being that, I’m noticing a lot on my evening commute. Sun sets during the long drive and they don’t realize they need lights. Some cars have always on day lights which confuses them too, but the dash lights would all be off so what’s going on in there? >

They don’t look at the dash, that’s how they don’t notice