Narcolepsy is a serious, but relatively uncommon, disorder characterized by sudden and uncontrollable attacks of sleep.

These attacks can be brief - lasting just 30 seconds - or longer, lasting as long as 30 minutes or more. Sometimes the attacks are accompanied by hallucinations and/or temporary paralysis.

Narcolepsy can be quite debilitating, causing lack of muscle control and dream experiences occurring at inappropriate times.

Sufferers often unexpectedly fall asleep in the middle of important activities, including driving and while playing sports. This can be quite dangerous for themselves and others.

In addition, they can fall asleep during conversations and at work, harming their personal and professional relationships.

Are you one of the sufferers of this disorder?