casanatensis (XIV century)]]A vigil (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, Eve of a Feast, Catholic Encyclopedia such as the Easter Vigil held on Holy Saturday. In the Eastern Orthodox Church a