Hypersomnia & Narcolepsy

Narcolepsy and idiopathic hypersomnia both cause severe daytime sleepiness, but they affect the brain and sleep patterns in different ways. A thorough evaluation at our Sterling Heights sleep clinic helps distinguish between them and guides effective treatment.

Narcolepsy

Narcolepsy is a neurologic disorder where the brain cannot properly regulate sleep and wake cycles. Many patients have a deficiency of orexin (also called hypocretin), a brain chemical that helps keep you awake. Typical narcolepsy features include:

• Sudden “sleep attacks” or irresistible urges to sleep during the day.
• Falling quickly into REM (dream) sleep when napping or at night.
• Cataplexy: sudden loss of muscle strength triggered by emotions such as laughter or surprise.
• Sleep paralysis: waking up or falling asleep while temporarily unable to move.
• Vivid dream‑like hallucinations when falling asleep or upon waking.

In narcolepsy with cataplexy (Type 1), patients have clear episodes of muscle weakness and often very low orexin levels. Narcolepsy without cataplexy (Type 2) causes similar sleepiness without the obvious muscle attacks.

Idiopathic Hypersomnia

Idiopathic hypersomnia also causes excessive daytime sleepiness, but patients do not typically have cataplexy, sleep paralysis, or frequent dream‑like hallucinations. People with idiopathic hypersomnia fall asleep easily and often sleep for long periods, but they do not enter REM sleep as quickly as patients with narcolepsy. These patients may:

• Sleep 9–11 hours at night and still feel unrefreshed.
• Take long, non‑refreshing naps.
• Have severe difficulty waking up (“sleep inertia”) and feel confused or foggy on awakening.

Both conditions are chronic, but with proper diagnosis and treatment at a specialized sleep clinic, symptoms can be significantly improved.

Hypersomnia is common and can be caused by many different conditions. Part of our job at the Sleep & Attention Disorders Institute is to determine whether your daytime sleepiness is due to narcolepsy, idiopathic hypersomnia, or another sleep or medical problem. Common causes of daytime sleepiness include:

• Sleep apnea: Loud snoring with repeated breathing pauses at night.
• Sleep deprivation: Not getting enough sleep; most adults need 7–9 hours per night.
• Narcolepsy: Daytime sleepiness with increased REM sleep pressure and quick transition into dream sleep.
• Idiopathic hypersomnia: Daytime sleepiness without the REM pattern seen in narcolepsy.
• Depression and other mental health conditions.
• Medications, especially psychiatric medicines and opioid painkillers.
• Drugs and alcohol.

Sleep deprivation and untreated sleep disorders can also mimic or worsen attention problems such as ADD/ADHD, which is especially important at a clinic that treats both sleep and attention disorders.

Testing for hypersomnia, narcolepsy, and idiopathic hypersomnia is done at our sleep clinic in Sterling Heights, Michigan. The evaluation is completely painless, and our experienced sleep technologists help patients feel comfortable and at ease throughout the process.

Overnight Sleep Study (Polysomnography)

Patients arrive in the evening and sleep overnight in one of our six private, hotel‑style bedrooms. We apply small sensors to the scalp and skin to monitor:

• Brain waves
• Eye movements
• Muscle activity
• Breathing and oxygen levels
• Heart rhythm
• Leg movements

This overnight study helps rule out or diagnose sleep apnea and other sleep disorders that can cause daytime sleepiness.

Next‑Day Nap Test (MSLT)

The morning after your overnight sleep study, we perform a Multiple Sleep Latency Test (MSLT), also called a nap test. You are given four or five nap opportunities throughout the day while we measure how quickly you fall asleep and whether you enter REM sleep.

• If you fall asleep quickly and often go into REM (dream) sleep, this suggests narcolepsy.
• If you fall asleep quickly but seldom go into REM sleep, idiopathic hypersomnia may be present.

Before testing, we typically ask patients to stop medicines that suppress REM sleep and keep a sleep diary to confirm they are getting enough time in bed. This helps ensure accurate, reliable results.

Treatment for hypersomnia and narcolepsy focuses on identifying and treating the underlying cause so you can stay awake, stay safe, and live a fuller life. Once we complete your evaluation, we create a personalized treatment plan based on your diagnosis, medical history, and lifestyle.

Treating the Cause of Daytime Sleepiness

• Sleep apnea: CPAP therapy keeps the airway open during sleep so your breathing and oxygen levels stay normal.
• Sleep deprivation: We recommend increasing time in bed and improving sleep habits so you consistently get enough sleep.
• Narcolepsy: Stimulant or wake‑promoting medicines improve alertness, and medicines that reduce REM sleep can help control sleep paralysis and cataplexy.
• Idiopathic hypersomnia: Stimulant or wake‑promoting medicines can reduce daytime sleepiness and improve function at work and school.

Most medications used to treat narcolepsy and idiopathic hypersomnia work on brain chemicals such as dopamine and norepinephrine to help you stay awake and alert. We discuss benefits, side effects, and safety with you in detail and monitor your progress over time.c

With proper treatment, many patients feel more energetic, more productive, and significantly reduce their risk of drowsy‑driving accidents.

Because the Sleep & Attention Disorders Institute specializes in both sleep and attention disorders, we pay close attention to how daytime sleepiness affects focus, memory, and behavior. Excessive sleepiness can look like ADD/ADHD, especially in children and young adults, and treating the underlying sleep condition can dramatically improve attention and school or work performance.

Our unique ADHD‑plus‑sleep niche makes our clinic one of the few places in Michigan where both issues can be evaluated and treated together, which is a key advantage over large health systems.