Diagnosing narcolepsy typically requires a sleep study, as symptoms alone aren't enough for confirmation. A polysomnogram (PSG) and Multiple Sleep Latency Test (MSLT) are key. The PSG monitors overnight sleep, while the MSLT measures daytime sleepiness. These tests help rule out other conditions like sleep apnea. Blood tests for hypocretin levels or genetic markers may also support diagnosis. If you experience excessive daytime sleepiness or sudden sleep attacks, consult a specialist for proper evaluation.