The discussion highlights a lack of comprehensive historical information on vigils, particularly those involving candles, which are often associated with religious gatherings. Candles served as a primary source of light before the advent of electricity and gas, leading to their use in nighttime ceremonies. The conversation mentions the historical context of candle-making, noting that oil lamps predated candles. For further research, resources such as the Chandler's Guild in London and the Wax Chandlers' website are recommended. Additionally, a book titled "The Hour of Our Death" by Philippe Ariès is suggested for its exploration of death rituals and societal perceptions of death, which may provide relevant insights into the historical significance of vigils.