A horrible sound

What in the last 40 years is the most redundant sound that you've ever woke up to?

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When I had my daughter, emergency csection, they had to give me a few more drugs as I felt the surgery... anyway, it meant 2 days in a semicoma situation. I was in my own room and next door to me was a woman who had had a reaction to the pain meds and was hallucinating.

Only found this out after I woke up to the most horrific screams that sounded like she was being killed or having an exorcism. Hard to tell.