#religious vigil
- Agrypnia — A pathological state characterized by total or prolonged insomnia, representing a severe disruption of the circadian sleep-wake cycle. In the context of Orthodox religious worship, the term denotes a lengthy and solemn night service (vigil), celebrated on the eve of major Christian feasts, implying a state of continuous spiritual wakefulness.
- Vigil fasting — The act of fasting on an eve and its result; total or partial abstinence from food and drink on the day preceding a major Christian holiday, as a form of penance, spiritual purification, and ascetic preparation. This religious custom is deeply rooted in Orthodox and Catholic liturgy, being considered a personal sacrifice aimed at enhancing prayer.