When you think of narcolepsy, you probably think of people falling asleep at seemingly random times, but it’s actually much more than that. It causes hallucinations, insomnia, sleep paralysis and can be triggered by moments of joy. Oh, and the key to understanding it came from studying man’s best friend.
SICK is a new series that looks at how diseases actually work inside our body. We'll be visiting medical centers and talking to top researchers and doctors to uncover the mysteries of viruses, bacteria, fungi and our own immune system. Come back every Tuesday for a new episode and let us know in the comments which diseases you think we should cover next.