‘Tis now the very witching time of night,
When churchyards yawn and hell itself breathes out
Contagion to this world: now could I drink hot blood.
And do such bitter business as the day
Would quake to look on.
– William Shakespeare
Hamlet, Act 3, Scene 2. Hamlet says it is now nighttime, when dark deeds are typically committed and evil prowls the world, and he can now murder Claudius to revenge his father’s murder.