Just as good and virtue, sin and evil can only be given in vigil. Who sleeps, sleeps; for the asleep there is no sin, just as there is no good, nor virtue. There is only sleep. - Judas Iscariot The Flight of the Feathered Serpent
I receive Thee ransom of my soul. For love of Thee have I studied and kept vigil toiled preached and taught… - Thomas Aquinas
As part of it's 'Astro' program LAPD helicopters maintain an average nineteen-hours-per-day vigil over 'high crime areas', tactically coordinated to patrol car forces, and exceeding even the British Army's aerial surveillance of Belfast.