[snowwrestler]

Cranial bleeding can be caused by blunt head trauma, can raise intra-cranial pressure high enough to kill you, and there are only three ways to detect it: a) medical imaging scans, b) changes in patient behavior, or c) drill a hole in the skull and insert a sensor.

If the patient is sleeping, you can't use a) or b). Now, there might be an argument that everyone should get c) and lots of sleep, but drilling into a person's head is not risk-free either.