Which of the following is NOT a symptom of sleep apnea?

Drooling is not considered a typical symptom of sleep apnea, making it the correct answer in this context. Sleep apnea primarily involves interruptions in breathing during sleep, which lead to various well-documented symptoms. Frequent daytime fatigue is a common manifestation of the disorder due to poor sleep quality and disrupted sleep cycles. Similarly, loud snoring is often reported by partners of individuals with sleep apnea, as the condition can be characterized by obstructed airflow leading to snoring sounds. Restlessness during sleep can also occur, as those with sleep apnea may repeatedly wake up or shift positions in response to breathing difficulties.

In contrast, drooling is not a direct symptom of sleep apnea. While it may occur in various sleep disorders or in individuals with certain conditions, it is not part of the classic presentation of sleep apnea and does not relate to the core mechanisms of interrupted breathing during sleep. Understanding the specific symptoms of sleep apnea helps in distinguishing it from other sleep disorders or conditions.