Which of the following is a common cause of seizures in adults?

Head trauma is a common cause of seizures in adults because it can lead to direct damage to the brain tissue, which may disrupt normal electrical activity. When a person experiences a significant impact to the head, there can be bleeding, swelling, or other injuries that create a conducive environment for seizure activity. Traumatic injuries can result in the formation of scar tissue, which can become a focus for seizure activity years after the initial injury.

In contrast, excessive hydration isn't typically implicated in seizure activity in adults, as it can lead to hyponatremia but is less common than trauma-related causes. Regular exercise, while important for maintaining overall health, does not inherently cause seizures and is often beneficial for brain health when performed appropriately. On the other hand, improper sleep hygiene can contribute to seizures in some individuals, particularly those with existing seizure disorders, but it is less frequently a standalone cause in healthy adults. Therefore, head trauma remains the most significant and recognized cause among the listed options.