Written by Dr. Anitha Paderla, MBBS | 
Medically Reviewed by dr. reeja tharu / dr. sunil shroff, MBBS, MS, FRCS (UK), D. Urol (Lond) on Apr 19, 2013


The most typical symptoms of hypersomnia are:

  • Excessive daytime sleepiness leading to prolonged naps that are not refreshing.
  • Nocturnal sleep of long duration (as much as 12 hr or more)
  • Sleep drunkenness
  • Difficulty in awakening the patients from sleep
  • Episodes of automatic behavior may also be present.

a. Idiopathic Hypersomnia (Primary Hypersomnia)

Symptoms of Hypersomnia
  • Idiopathic hypersomnia is characterized by long periods involving episodes of excessive daytime sleepiness. Most of the time the symptoms are present.
  • Some people with this disorder experience automatic behavior such as:
  1. Headaches
  2. Dizziness
  3. Cold hands and feet
  4. Depression symptoms

b. Post - traumatic Hypersomnia:

  • Post - traumatic hypersomnia may mimic idiopathic hypersomnia.


  1. Primary Hypersomnia - (http://www.emedicine.com/med/topic3129.htm)
  2. Hypersomnia - (http://www.sleepdisordersguide.com/hypersomnia.html)

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