Walk into almost any hospital in Texas at 3 a.m. and you'll hear it before you see it: the rhythmic beep of an IV pump, a cart wheel squeaking down a linoleum hallway, an overhead page, a monitor alarm nobody rushes to silence, a door that never quite closes softly. Multiply that by every patient room, every nursing station, every floor, and you get a soundscape that the World Health Organization says should never exceed 35 decibels at night - yet regularly spikes past 85. Fo