Sally had been asleep for just over two hours when she suddenly let out a piercing cry and sat straight up in her bed.When her parents asked what had scared her,she really couldn't remember,and she soon fell back to sleep.From this description,what did Sally experience

A)  a nightmare 
B)  a night terror 
C)  REM deprivation 
D)  sleep apnea

Night Terror

A sleep disorder causing feelings of panic or dread typically occurring during the first hours of stage 3-4 non-REM sleep and often resulting in loud screams or physical actions.

Piercing Cry

A very loud and high-pitched scream or shout, often indicating distress or alarm.

REM Deprivation

The condition of being deprived of Rapid Eye Movement sleep, a stage of sleep associated with dreaming, which can lead to various psychological and physiological effects.