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People who have a sleep problem associated with mental illness are likely to display two sets of symptoms. The first set of symptoms is related to the mental disorder itself. These vary from condition to condition.

The second set of symptoms is related to the sleep problem. For example, patients with insomnia may experience any of the following symptoms:

• Increased anxiety at bedtime
  
  
• Tendency to spend too much time in bed
  
  
• Improvement in sleep patterns once the patient is removed from the typical sleep environment

Patients experiencing hypersomnia may exhibit symptoms such as:

• Fatigue or complete lack of energy
  
  
• Difficulty concentrating
  
  
• Tendency to fall asleep easily in low-stimulation situations
  
  
• Feelings of disorientation upon waking
  
  
• Decreased appetite
  
  
• Irritability
  
  
• Memory impairment