Excessive daytime sleepiness (hypersomnia)

The sleep disorder called hypersomnia is associated with sleeping too much during the day and night. When people have hypersomnia they get excessive daytime sleep in the daylight hours. However, they are still tired at night and need a full night of sleep. It is the opposite of insomnia in which people cannot go to sleep. Hypersomnia is also associated with other sleep disorders including Sleep Apnea. Learn more about hypersomnia causes, tests, and treatments.


Forms of hypersomnia can include conditions caused by medical conditions or injuries. For example, an individual diagnosed with Sleep Apnea may also suffer from hypersomnia. In this case, secondary hypersomnia refers to being unable to sleep due to Obstructive Sleep Apnea that blocks the airways. As a result, the individual sleeps more during the day to make up for a lack of quality deep sleep at night.

Other causes of secondary hypersomnia include:

  • Neuromuscular disorders
  • Neurodegenerative diseases, such as Parkinson’s disease
  • Substance use or abuse
  • Insufficient sleep syndrome
  • Psychiatric disorders, such as depression

Other Symptoms of Sleep Apnea

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