If they're waking you up to take blood samples when you're sleeping, it's probably for good reason. Maybe the patient is at risk for some kind of kidney complications and maybe not dying from renal failure is more important than getting a good night's sleep. There could be any number of reasons for this. Maybe another patient had some kind of emergency that had to be dealt with first, and your sleep schedule is less important than someone else's life.
Generally speaking, doctors and nurses care about patients (some more than others, sure). They're also aware of the importance of sleep. If you're a nurse on a night shift, and you have to take care of a ward of 20 patients, you'll quickly find yourself too busy to be terribly considerate. Especially when something unexpected happens.
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.
Generally speaking, doctors and nurses care about patients (some more than others, sure). They're also aware of the importance of sleep. If you're a nurse on a night shift, and you have to take care of a ward of 20 patients, you'll quickly find yourself too busy to be terribly considerate. Especially when something unexpected happens.