A (from the Latin ''vigilia'', 'wakefulness') is a period of sleeplessness, an occasion for devotional watching or observance.
- It can also be the eve of a religious festival observed by staying awake as a devotional exercise or ritual devotions observed on the eve of a holy day, such as the Easter Vigil held on Holy Saturday .
- It is also part of the title of a poem by Walt Whitman , "Vigil Strange I Kept on the Field One Night".
- When a Jewish Person dies, a watch is kept over the body and Tehillim are recited constantly, until the burial service.
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