Hypersomnia: Symptoms & Signs

Medically Reviewed on 9/10/2019

Hypersomnia refers to excessive sleepiness. It is a condition in which the affected person has difficulty staying awake during the day.

Signs and symptoms of hypersomnia are related to the excessive sleepiness and can include falling asleep while at work or school, or while driving. Other associated symptoms can include irritability, memory problems, slow thinking or trouble thinking clearly, slow speech, anxiety, appetite loss, and an overall feeling of low energy.

Causes of hypersomnia

There are many conditions that can cause hypersomnia, including head injury, drug or alcohol abuse, sleep deprivation, sleep apnea, overweight, the sleep disorder known as narcolepsy, or other neurologic conditions. Certain prescription or nonprescription drugs may also cause hypersomnia.

Other hypersomnia symptoms and signs

  • Anxiety
  • Appetite Loss
  • Difficulty Staying Awake During the Day
  • Falling Asleep at Any Time
  • Irritability
  • Low Energy
  • Memory Problems
  • Slow Speech
  • Slow Thinking


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Kasper, D.L., et al., eds. Harrison's Principles of Internal Medicine, 19th Ed. United States: McGraw-Hill Education, 2015.