What is hypersomnia?

Hypersomnia is a sleep disorder in which the patient suffers from daytime sleepiness and struggle to stay awake throughout the day. Hypersomnia may be idiopathic, or it may result from other issues, such as sleep apnoea or insomnia.

Hypersomnia is a disorder that significantly affects the person who suffers from it, decreasing their performance capacity, both at work and socially.

There are different types of hypersomnia:

  • Idiopathic or primary hypersomnia: the causes are not known. People suffering from primary or idiopathic hypersomnia can sleep up to 20 hours and remain tired and be irritable.
  • Secondary hypersomnia: when their daytime sleepiness results from secondary causes, such as sleep deprivation, either because of insufficient sleep or because it is interrupted. It may also result from some drugs or medications, or some medical or psychiatric disorder. In this case, hypersomnia is the symptom of the disorder, not the disorder itself.


Hypersomnia can be serious in the sense that it affects the day-to-day life of the patient, as well as their work and personal relationships. In addition, hypersomnia patients could fall asleep at very serious times, endangering their lives. Sleep disorders greatly impair the patient's overall quality of life, and other problems are associated with them. Narcolepsy is the most severe case of hypersomnia, causing excessive drowsiness and uncontrollable and frequent sleep attacks throughout the day, occurring every 3-4 hours normally. Furthermore, the urge to sleep is irrepressible and incapacitates the patient to continue their daily routine.

Symptoms of hypersomnia

People suffering from hypersomnia have great difficulties in staying awake, which causes fatigue, tiredness, loss of concentration and a loss of attention in their environment.

The key traits of someone suffering hypersomnia are:

  • Napping throughout the day without feeling revitalised
  • Sleeping for long hours at night
  • Falling asleep in the day, even when performing other activities.

Medical tests for hypersomnia

First of all, the doctor will make a physical examination and take a history of sleeping patterns and behaviours. The specialist may also request the following tests:

  • Blood test
  • CT scan
  • Polysomnography (sleep study)

What are the causes of hypersomnia?

The causes of hypersomnia are varied and in most cases there are usually underlying disorders or problems, such as:

Can hypersomnia be prevented?

Hypersomnia can only be prevented in cases of secondary hypersomnia, that is, if excessive sleepiness is caused by sleep deprivation, then addressing should prevent hypersomnia.

It’s also important to have good sleep hygiene in general:

  • Maintain regular schedules and routines, that is, get up at the same time each day.
  • Relax before going to bed.
  • Do light physical exercise about three days a week.

Treatments for hypersomnia

Treating hypersomnia is very important as it is a disorder that greatly affects the patient's life and can even be dangerous. It is recommended that the patient improves their sleep hygiene where possible. Certain patients may also be advised to avoid driving heavy machinery or vehicles.

For cases of secondary hypersomnia, the underlying cause should be addressed accordingly. Depending on the underlying cause the following treatments may be suggested:

  • CPAP machine (sleep apnoea)
  • Anti-depressants
  • Medications
  • Eliminating caffeine and alcohol
  • Cognitive-behavioural therapy

Which specialist treats hypersomnia?

The specialist who treats hypersomnia and other sleep disorders may include neurologists, psychologists and specialists in respiratory medicine.