witching hour

noun4

1. •
   The hour between 3:00 and 3:59 a.m., associated with demons.

   • "Do you know what three a.m. is?" […] "It's called the witching hour. It's the reverse of the holy hour—three p.m.—when Jesus died on the cross.[…]" — 2008
2. •
   (literary) Often preceded by the: midnight, when witches and other supernatural beings were thought to be active, and to which bad luck was ascribed; also (generally), the middle of the night, when unfortunate things are thought to be more likely to occur; the dead of night.

   • I wanted to get home before the witching hour.
3. •
   A time of day, usually in the early evening, when babies and young children are more fretful and likely to cry or fuss.
4. •
   The final hour of trading each month during which certain stock options expire, leading to a higher trading volume and greater price volatility.