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Communities often distressed by injustice, violence and crime hold vigils in response to grief, outrage or mourning over a tragedy, and as demonstrations of public protest and expressions of community solidarity with victims and their families.

Communities often distressed by injustice, violence and crime hold vigils in response to grief, outrage or mourning over a tragedy, and as demonstrations of public protest and expressions of community solidarity with victims and their families.

Combat personnel and civilians facing the certain and immanent approach of deadly danger to come on them in the morning, and prisoners scheduled for execution, involuntarily keep vigil in fearful anticipation of death.  

Combat personnel and civilians facing the certain and immanent approach of deadly danger to come on them in the morning, and prisoners scheduled for execution, involuntarily keep a wakeful vigil all through the night in fearful anticipation of death.  

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.