It is a growing problem among low cost crews and I fear it is becoming a ticking time bomb. Why? Because nobody wants to know. Airlines, unions, regulators,politicians even the NHS ( public health service in the UK ) don't want to know.
Traders in the stock market burnout and no-one cares, not very charitable but understandable. Pilot's and cabin crew burnout and still no-one cares, but how much more dangerous that is !!
I have got out of the (pilot) profession now because it was ruining my health in all aspects. Goodness knows what will happen in the near future. Watch this space........................