Both men and women
Narcolepsy affects both men and women equally.
Around 30,000 sufferers in the UK
Narcolepsy is believed to affect approximately 1 person in 2,500. It has been estimated that around 30,000 people in the UK suffer from narcolepsy.
Most are undiagnosed
It has also been estimated that about 80% of people with narcolepsy in the UK are undiagnosed and currently untreated. Experience suggests that in many cases it can take several years from the development of the first symptom for a definitive diagnosis of the condition to be made.
People all over the world are affected
Narcolepsy appears throughout the world in every racial and ethnic group. However, occurrence rates vary among populations. Compared to the UK population, for example, the occurrence rate of narcolepsy is substantially lower in Israel (about 1 per 500,000 people) and considerably higher in Japan (about 1 per 600).
When does it start?
Most patients experience the onset of symptoms of narcolepsy between the ages of 15 and 30. However, onset in young childhood or middle age also occurs.