Insomnia: Symptoms and Causes
Insomnia is a sleep disorder that is characterized by difficulty falling and/or staying asleep. People with this sleep disorder have one or more of the following insomnia symptoms:
Insomnia can be its own medical problem (primary insomnia) or it can be caused by a separate issue (secondary insomnia) such as depression or side effects from medication. Insomnia may be an acute (short-term) problem, meaning it lasts less than 1 month, or it can be chronic, lasting 1 month or longer.
Situations that may cause a period of acute insomnia can include:
Causes of chronic insomnia include:
Reviewed by: The Sleep Medicine Center at The Cleveland Clinic.
Reviewed by Cynthia Dennison Haines, MD
SOURCES: The National Sleep Foundation. American Insomnia Association.
Last Editorial Review: 4/2/2007
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