CHESTERFIELD, VA (WWBT) - Dr. Judith McKenzie is on top of narcolepsy.

The symptoms are excessive daytime sleepiness, memory problems, depression and sudden spells of weakness.

Despite adequate rest, people with narcolepsy remain very tired. There is no preventive strategy for narcolepsy.

If you think you may have narcolepsy, talk to your primary doctor about how you could be tested.

Copyright 2013 WWBT NBC12. All rights reserved.