MSFinals-4343

A 5-year-old girl is brought to the emergency department by her mother. Her mother noticed her face twitching and mouth drooling while trying to wake her up this morning. The episode lasted for 30 seconds and the girl was fully aware of what was happening. The girl has been feeling drowsy and confused for the past 15 minutes. She has been healthy and has no medical conditions. Her mother is concerned that she has been staying up late for the past few nights, which may have contributed to her fatigue. What is the most probable diagnosis?