1. Causes of Fatigue Slideshow Pictures
2. Take the Sleep Quiz!
3. Foods That Help or Harm Your Sleep Slideshow Pictures

Symptoms commonly found in persons with a circadian rhythm disorder related to the sleep-wake cycle can include the following:

• Difficulty initiating sleep
  
  
• Difficulty maintaining sleep
  
  
• Nonrestorative sleep
  
  
• Daytime sleepiness
  
  
• Poor concentration
  
  
• Impaired performance, including a decrease in cognitive skills
  
  
• Poor psychomotor coordination
  
  
• Headaches
  
  
• Gastrointestinal distress

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