Which of these factors is NOT a known trigger for seizures in adults?

High blood sugar, or hyperglycemia, is generally not associated with triggering seizures in adults. Seizures are more commonly linked to factors such as stress, lack of sleep, and drug abuse, all of which can destabilize the brain's electrical activity and provoke a seizure.

In contrast, high blood sugar typically does not inherently cause seizures. Instead, it can lead to other complications, including diabetic ketoacidosis or hyperglycemic hyperosmolar state, which are medical emergencies that can have neurological effects, potentially including altered consciousness or seizures, but only under extreme or prolonged conditions. Therefore, while managing blood sugar levels is crucial for individuals with diabetes, it is not classified as a direct seizure trigger like the other options listed.