• Insomnia - Introduction
• Highlights
• Causes of Short-Term and Transient Insomnia
• Causes of Chronic Insomnia
• Risk Factors
• Complications
• Diagnosis

Introduction

Insomnia comes from the Latin words for no sleep. Insomnia is characterized by:

• Difficulty falling asleep
• Difficulty staying asleep
• Waking up too early
• Poor quality ("non-restorative") sleep

Insomnia may be primary or secondary:

• Primary insomnia means that the inability to sleep is not caused by other health problems.
• Secondary insomnia is due to other health conditions that interfere with sleep. It is also called comorbid insomnia.

Duration of Insomnia

Insomnia is often categorized by how...