## **Core Concept**
The question describes a scenario where a child wakes up at night, sweating and terrified, but does not remember the episode. This presentation suggests a type of sleep disorder or nocturnal seizure. Understanding the characteristics of different sleep-related conditions and their effects on memory and nighttime behavior is crucial.

## **Why the Correct Answer is Right**
The correct answer, **Night Terrors (Sleep Terrors)**, is a type of sleep disorder that occurs during deep sleep (slow-wave sleep) and typically happens in the first third of the night. During an episode, the child may sit up, scream, and show signs of extreme fear or anxiety, such as tachycardia, tachypnea, and sweating. A key feature of night terrors is that the child usually does not remember the episode in the morning, which aligns with the scenario provided. This condition is more common in children and is often associated with arousals from slow-wave sleep.

## **Why Each Wrong Option is Incorrect**
- **Option A:** This option is not provided, but typically, incorrect options might include conditions like sleepwalking (somnambulism), nightmares, or nocturnal seizures.
- **Nightmares** occur during REM sleep, usually in the second half of the night, and the individual often remembers the distressing dream, which is not the case here.
- **Nocturnal seizures** can cause a variety of symptoms during the night, including fear, but are usually associated with other seizure-like activity and may be remembered if the individual awakens during or immediately after the seizure.
- **Sleepwalking (Somnambulism)** involves getting up and walking around during deep sleep, but it does not typically involve the intense fear and autonomic arousal seen in night terrors.

## **Clinical Pearl / High-Yield Fact**
A key clinical pearl is that **night terrors** are often precipitated by factors such as sleep deprivation, stress, and fever. They are more common in children and usually decrease in frequency as the child grows older. Unlike nightmares, night terrors do not occur during REM sleep, which is when dreams occur, and the child does not recall the episode.

## **Correct Answer: B. Night Terrors.**