The blood checks I brought up because this was a thing specifically criticised by my friends in the medical trade. For the vast majority of cases where they need to take blood, it just so happens to be the
preferred method used for diagnosing the patient, not the
only method. There are other things that can be done beyond waking the patient and sticking a needle in their arm. Often they just end up disposing it, as they don't even have the resources to test the blood of every patient every hour; but they will continue to
take blood every hour. If the nurses are told to take blood, they will do it to protocol - regardless of what common sense might suggest.
The main criticism they had was that of treatment for patients with infection. It's nice for a doctor to know whether the body is fighting it off effectively or not. Many doctors will ask for blood tests every hour because it's so nice to know, and you'll get a pretty graph to tell you what's going on by the hour. You know what's better than a graph? Letting the patient fight off said infection. Best way to do that? Decent sleep. Apparently the education on sleep is abysmal in most institutions currently, purely because it's been a branch of medicine that has bloomed late, and it has resulted in doctors who often don't give sleep the respect it deserves.
Again, this is not from the horses mouth. I am only passing on the information my friends gave me as effectively and accurately as I can. I'm not trying to shit on those in the medical profession, as it's a career I envy, but it is something that is a chronic issue in most wards and many sleep specialists across the globe are trying their hardest to rectify it with significant push back.