unsleeping

adjective3

1. •
   Not sleeping.
2. •
   Remaining constantly active.

   • Five hundred miles of moonlit fields and sleeping villages; of black towns and unsleeping furnaces; rain, fog, and frost; snow flurry and flood; tunnel and viaduct. — 1996
3. •
   (figurative) Remaining constantly alert.

   • Did you fixedly gaze, too, upon that ribbed and dented brow; there also, you would see still stranger foot-prints—the foot-prints of his one unsleeping, ever-pacing thought. — 1851