What is the difference between a bad dream and a nightmare?

What is the difference between a bad dream and a nightmare?
A)Bad dreams occur in REM and nightmares occur in NREM sleep.
B)Nightmares awaken the sleeper, bad dreams do not.
C)There is no difference between the two; they are different terms to describe the same experience.
D)Nightmares are a dyssomnia while bad dreams are parasomnias.


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