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Although more than 200 sleep disorders centers exist in the United States, experts estimate that 95 percent of those suffering from sleep disorders go undiagnosed, suffering needlessly from conditions that could be treated.

Whether you have a sleep disorder and you're looking for sleep disorder information, or you're looking to find ways to counteract your sleep disorder, this sleep disorders primer will give you relevant sleep disorders information to help you get the good night's sleep you desperately need.

• Delayed Sleep Phase Disorder: In delayed sleep phase insomnia, the person falls asleep and awakens later than required for normal activities such as work and school.
• Jet Lag: Jet lag is a common problem for travelers, and more common in those over 50 than in those under 30.
• Sleepwalking: Sleepwalking, which is most common in children, occurs during stage 3 and stage 4 sleep, the deepest levels, and is thought to be caused by a partial arousal from deep sleep.

Full list at HowStuffWorks.com.

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