Having nightmares

[Angrboda]

From my understanding Night Terrors are something that you believe to be real even after fully awake. Night Terrors usually occur when you are in a partially conscious state but other sections of your brain are switched off in hibernation mode.

I believe you are thinking of sleep paralysis, not night terrors. (Apparently there's another parasomnial disorder known as confusional arousal ["Confusional arousal is a condition when an individual awakens from sleep and remains in a confused state. It is characterized by the individual's partial awakening and sitting up to look around. They usually remain in bed and then return back to sleep."])

Sleep paralysis is a phenomenon in which people, either when falling asleep or wakening, temporarily experience an inability to move. More formally, it is a transition state between wakefulness and rest characterized by complete muscle atonia (muscle weakness). It can occur at sleep onset or upon awakening, and it is often associated with terrifying visions (e.g., an intruder in the room), to which one is unable to react due to paralysis. It is believed to be a result of disrupted REM sleep, which is normally characterized by complete muscle atonia that prevents individuals from acting out their dreams.