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Night Terrors are sudden, dramatic interruptions in our sleep and are quite different to nightmares. 
Nightmares occur after several hous of sleep, the dream phase of REM sleep, and they wake up the sleeper with a vivid memory of the dream. 
Unlike night terrors, nightmares do not usually involve screaming, thrashing about or running around without a [...]

Almost everyone has experienced dreams that contain anxiety or fear.  These experiences can be traumatic and haunt us by recurring repeatedly.

Typical Nightmare Themes

falling
being chased or attacked
walking into a meeting or a class unprepared
being stuck in slow motion
being trapped and unable to move or scream
drowning or choking
being naked in public

Experiencees of this sort are unpleasant and [...]