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

c. Recurring Hypersomnia

  • This condition is characterized by frequent episodes of excessive daytime sleepiness that can go on for many days, extending even up to a year.
  • Persons experiencing recurring hypersomnia are perfectly normal during these episodes of hypersomnia.

i. Kleine Levin Syndrome (KLS)

The main symptoms are recurrent episodes of excessive daytime sleepiness associated with:

  • Hyperphagia characterized by periods of voracious appetite alternating with prolonged sleep.
  • Behavioral disturbances, impaired thought processes, and hallucinations may be present.
  • Patients wake up feeling tired and lethargic.

They may seem to be confused, apathic and disoriented.These symptoms recur in cycles and may extend for days/weeks.

The episode may occur as often as several times a year, with acute illness or fatigue preceding it. Between attacks the person recovers completely. This disorder of excessive sleep periods usually disappears in adult hood. This syndrome may easily be mistaken for other neurological, metabolical or psychiatric diseases.

Some of the other features of this syndrome are:

  • Overeating
  • Agitation
  • Mood swings
  • Mental confusion
  • Hallucination

ii.Menstrual-Related Hypersomnia

Hormonal imbalance may trigger hypersomnia where –

  • Sleep attacks coincide with the menstrual cycle and lasts throughout cycle.


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

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