In military and nautical terms a regular vigil is called a '''watch''', as for example a ''night-watch'' on a [[Sentinel|sentry]]-posting for security against intrusion or attack. [[Prison]]s assign [[suicide]] watch to prevent condemned prisoners from attempting suicide to escape execution or life-sentences without parole. Hospital, police and security personnel frequently refer to the regular posting or assignment to the night shift as the "graveyard shift", normally eight hours of duty. | In military and nautical terms a regular vigil is called a '''watch''', as for example a ''night-watch'' on a [[Sentinel|sentry]]-posting for security against intrusion or attack. [[Prison]]s assign [[suicide]] watch to prevent condemned prisoners from attempting suicide to escape execution or life-sentences without parole. Hospital, police and security personnel frequently refer to the regular posting or assignment to the night shift as the "graveyard shift", normally eight hours of duty. |