Please look up studies by Mathew Walker. They did numerous studies with people claiming coffee did not affect their sleep. What they found was while those people would fall asleep, and sleep throughout the night, the quality of the sleep (i.e. minutes in deep sleep) was substantially worse.
But I agree that abuse is what is causing majority of the problems (and it was in my personal case)
In my personal unscientific opinion, I am observing complete opposite - coffee is the modern evil of our society.
My gut feeling is telling me that coffee and digital devices are responsible for big parts of the population suffering from mental illnesses, caused via chronic sleep deprivation. Of course majority of those mental illnesses are under reported - being sleep deprived for months does not make you bipolar maybe, but depression can and does happen (as well as myriad of other issues).
There are too many studies who show relationship between sleep and all kinds of illnesses (majority - mental), and nobody can argue that coffee is NOT responsible for that at least partially.
When I recently quit on coffee, I had such strong withdrawal symptoms, I was unable to function for 4 days. I had strong headaches and was almost vomiting.
No study will convince me this is a good/healthy thing for a human body. It is drug which is so omni-present, if you look around it is scary.
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