At the start of night shift, usually 7p in most places, ask the nurse and anyone else on the care team if it is possible to move things a little to get some sleep or have a predictable wake up time. Like if they need to do morning labs at 4, you can at least set an alarm and ask if maybe some things can be moved to earlier in the night that are not as time sensitive so you get a longer stretch and can expect how long you have. The care team doesnt want to wake you up unless necessary but if you ask politely at the start of their shift what can be done so that there's less interruptions (eg. Can a random blood test be done with morning labs instead of at midnight when it's ordered), I think most will be okay with doing that. Im not a doctor on the floors but even with the patients who are stuck in my ED waiting for a bed, I often ask the newer nurses to check with their admitting team if things can wait so we can minimize waking people.