Final answer:
A person experiencing intense panic and physical reactions like screaming and thrashing during sleep is likely having a night terror, a type of parasomnia occurring usually during the NREM sleep phase. The correct option is A).
Step-by-step explanation:
A person experiencing blind panic, screaming, and thrashing around while sleeping, likely suffers from a night terror, also known as a sleep terror. This sleep disorder is characterized by an intense sense of panic and may include screaming or attempts to escape from the immediate environment.
Unlike nightmares, which occur during REM sleep, night terrors generally happen during the NREM phase of sleep. Individuals typically do not remember the episode upon waking and often return to sleep quickly thereafter.
Night terrors are considered a type of parasomnia, a category of sleep disorders that involve unwanted, disruptive motor activity and/or experiences during sleep. Option A) is the correct one.