What is one day-time symptom commonly associated with sleep apnea?

Headaches are a common daytime symptom associated with sleep apnea. This condition disrupts normal sleep patterns, leading to a reduction in the quality and quantity of sleep. As a result, individuals may experience a type of headache known as a “hypnic headache” or tension headaches, which are often related to the lack of restorative sleep. These headaches can be particularly pronounced in the morning, following a night of interrupted sleep caused by apneic episodes. The cyclic nature of these episodes leads to fragmented sleep, which often contributes to morning headaches, set against a backdrop of insufficient oxygenation during sleep.

In contrast, the other options involve positive aspects that are typically not associated with sleep apnea. Increased energy levels, enhanced cognitive function, and improved mood stability are generally diminished in individuals experiencing the condition due to the negative impact of sleep deprivation and poor sleep quality. Thus, headaches stand out as a direct consequence of sleep apnea's disruptive nature and its effect on overall well-being.