The lovely young girl who works at my local chemist has a dad who works shift work in manufacturing. She has explained to me that if he is too tired for his night shift duty all he has to is ring in and say he is tired. No questions asked whatsoever . No 4 page form including a statement on his mental health or lack of. That sounds like a company with values including "progressive" and " forward thinking" to me.
It is only 12 months since my area changed fatigue from a psychological issue to a physiological issue.