reign of terror 
noun
A period of remorseless repression or bloodshed, in particular (Reign of Terror) the period of the Terror during the French Revolution.He became a dictator, enforcing a reign of terror with his secret police, sometimes referred to as tonton macoute....
- During his reign of terror, Wright threatened residents and council staff, often using racial abuse.
- The Nigerian state responded by imposing a reign of terror.
- sleeping car
- sleeping carriage
- sleeping draught
- sleeping partner
- sleeping pill
- sleeping policeman
- sleeping sickness
- sleep-learning
- sleepless
- sleeplessly
- sleeplessness
- sleep like a log (or top)
- sleep mode
- sleep on it
- sleep (or rest) easy
- sleep out
- sleep over
- sleepover
- sleep rough
- sleep something off
- sleepsuit
- sleep tight
- sleep-train
- sleep training
- sleepwalk