What is the difference between narcolepsy and idiopathic hypersomnia?

One of the earliest signs of narcolepsy is suddenly falling asleep during the daytime, even if you have had a full night’s sleep. This excessive sleepiness is like a “sleep attack” or an overwhelming sense of sleepiness that comes on quickly, and narcolepsy should be considered if a child or teen habitually falls asleep in class, or an adult finds themselves constantly dozing off at work, despite having had a full nights sleep. In between these sleep attacks, people with narcolepsy have normal levels of alertness, particularly if they are doing something that keeps their attention. Narcolepsy most commonly starts in young adults, aged 15 to 25, although it can occur at any age. Continue reading

The main test used to help diagnose suspected narcolepsy is an overnight sleep study (called a polysomnogram) followed the next day by the Multiple Sleep Latency Test (MSLT). A polysomnogram records brain waves, eye movements, muscle tone, and breathing across a night of sleep. This evaluates the amount and quality of night-time sleep and can look for any evidence of an additional sleep disorder (such as sleep apnea or periodic limb movements in sleep). The MSLT is a series of five scheduled naps spread across the day and it is done the day after the polysomnogram so a doctor can determine whether the prior night’s sleep could be affecting the daytime naps. Every 2 hours, the person is allowed to sleep for 20 minutes or more. Continue reading