Depending on the situation, it's necessary to check the status of the patient every hour or so. If a condition carries e.g. an increased risk of stroke, there is no way to check for it except asking the patient to move and talk. A good night of sleep is valuable, but if you wake up with a severe paralysis and after the time window that allows e.g. removal of a clot, it's been too high a price for a few nights of good sleep