While excessive sleepiness, cataplexy (sudden muscle weakness), sleep paralysis, and hallucinations are common, rarer symptoms of narcolepsy include severe daytime fatigue not relieved by sleep, automatic behaviors (doing things without remembering), vivid dreaming, disrupted nighttime sleep, brain fog, and potential weight gain. Some rare occurrences can involve cataplexy preceding sleepiness, unique childhood symptoms like tongue protrusion, or the less common presence of abnormal carnitine levels.
Secondary Narcolepsy
This is the rarest type. It can happen after an injury to a deep part of your brain called the hypothalamus that regulates your sleep. Secondary narcolepsy also can be caused by a brain tumor, multiple sclerosis, or brain inflammation called encephalitis.
Narcolepsy can also cause cataplexy, brief episodes of muscle weakness triggered by strong emotions. In addition, narcolepsy can cause fragmented sleep with vivid dreams, and hallucinations and brief paralysis when dozing off or waking up. These symptoms typically begin between ages 10 and 20.
The five key signs of narcolepsy, often remembered by the acronym CHESS, are Cataplexy (sudden muscle weakness), Hallucinations (vivid dream-like images), Excessive Daytime Sleepiness (EDS), Sleep Paralysis (inability to move when falling asleep or waking), and Sleep Disruption (fragmented nighttime sleep). These symptoms reflect a disruption between wakefulness and REM sleep, with elements of sleep intruding into the waking state.
Type 2 narcolepsy (previously known as narcolepsy without cataplexy)—People with this condition experience excessive daytime sleepiness but usually do not have cataplexy. They usually also have less severe symptoms and normal hypocretin levels.
Narcolepsy in pediatric patients is often misdiagnosed as a more common medical condition, such as attention-deficit/hyperactivity disorder (ADHD), epilepsy, depression, syncope, or other sleep disorders.
Decreased serum vitamin B12 levels are independently associated with the development of narcolepsy, which illustrates the complex relationship between vitamin B12 and narcolepsy.
What causes narcolepsy?
These include:
Narcolepsy symptoms usually first occur between age 15 and 30 years. Below are the most common symptoms. You may feel a strong urge to sleep, often followed by a period of sleep. You can't control when you fall asleep.
Extreme daytime sleepiness.
Daytime sleepiness is the first symptom to appear, and the sleepiness makes it hard to focus and function. People with narcolepsy feel less alert and focused during the day. They also fall asleep without warning. Sleep can happen anywhere and at any time.
Clinical relevance: New data shows that a new orexin-targeting drug, oveporexton, curbs narcolepsy symptoms and appears to improve cognition. Unlike existing treatments, oveporexton replaces missing orexin signaling by triggering the OX2R receptor.
Individuals with Narcolepsy may face a variety of challenging symptoms, including EDS, fragmented nocturnal sleep, sudden sleep attacks, vivid hallucinations, cataplexy, sleep inertia, short-term memory lapses, impaired executive function and mental health issues.
EEG also plays a central role in diagnosing and understanding sleep disorders. By monitoring brain wave activity, breathing, and muscle movements during sleep, EEG can detect conditions like sleep apnea, restless leg syndrome, narcolepsy, and insomnia.
What aggravates narcolepsy? Several factors can worsen narcolepsy symptoms, including: Stress: High stress levels can worsen your sleep patterns and trigger episodes of excessive daytime sleepiness. Irregular sleep schedules: An inconsistent sleep schedule can make it harder to manage narcolepsy.
Also known as “Sleeping Beauty Syndrome,” Klein-Levin Syndrome (KLS) is a rare sleep disorder marked by recurring episodes of hypersomnia where the patient sleeps for extensive lengths of time: up to 20 hours per day.
Many cases of narcolepsy are thought to be caused by a lack of a brain chemical called hypocretin (also known as orexin), which regulates sleep. The deficiency is thought to be the result of the immune system mistakenly attacking parts of the brain that produce hypocretin.
B12 deficiency can trigger specific food cravings, most notably for meat, fish, or eggs, as the body seeks animal-based sources to replenish the vitamin, especially in those on vegetarian/vegan diets or older adults. While cravings for sugary or salty foods can also signal general B-vitamin issues, the distinct urge for protein-rich animal products is a key indicator, but professional testing is crucial for confirmation.
Vitamin B12
Vitamin B12 helps make your DNA, produce red blood cells and protect your nervous system. “Red blood cells transport oxygen through your body,” explained Dr. Shah. “So, when you don't have enough B12 to produce red blood cells, oxygen doesn't get transported to your cells, which leaves you feeling tired.”
MRI analyses revealed discernible structural deviations in the brains of patients with narcolepsy, particularly in the thalamus, hypothalamus, and various cortical areas, including fronto-orbital areas, temporal lobes, and the cingulate cortex [78,79].
Low-Carb Diets for Narcolepsy
Choosing complex carbohydrates like berries, whole grains, legumes, and sweet potatoes can help normalize sleep patterns. Minimizing processed foods and added sugar can improve sleep quality as well.
Narcolepsy causes sleepiness not due to sleep deprivation, poor sleep quality, or sleep apnea. Narcolepsy type 1 is caused by damage to a certain part of the brain (the hypothalamus), resulting in decreased production of orexin, a hormone that helps maintain wakefulness.
Symptoms include weak muscles, numbness, trouble walking, nausea, weight loss, irritability, fatigue, and increased heart rate.
Vitamin B12 deficiency: a rare cause of excessive daytime sleepiness. J Clin Sleep Med. 2019;15(9):1365–1367.
Take Care With Caffeine
Coffee, tea, or other caffeine-fueled eye-openers may help prevent drowsiness. But take care if you take stimulant medications such as armodafinil (Nuvigil) or modafinil (Provigil) for your narcolepsy. Mixing them with caffeine can make your heart race or trigger jitters and anxiety.