https://www.tuftandneedle.com/resources/what-is-the-witching-hour/
In folklore, the witching hour or devil's hour is a time of night associated with supernatural events. Witches, demons and ghosts are thought to appear and to be at their most powerful. Black magic is thought to be most effective at this time. In the Western Christian tradition,the hour between 3 and 4 a.m. was considered a period of peak supernatural activity, due to the absence of prayers in the canonical hours during this period.[1] Women caught outside without sufficient reason during this time were sometimes executed on suspicion of witchcraft.[1] The phrase "witching hour" was first recorded in 1793.[2]
https://en.wikipedia.org/wiki/Witching_hour