Miya Pearson
Narwhals are fascinating creatures that have long been associated with the mythical unicorn due to their distinctive 'horn'. They are whales that live in the Arctic Ocean and are rarely found below 65° north in latitude. They are highly intelligent, social animals that live in pods of two to thirty, and sometimes come together to form huge herds containing hundreds of whales. They are also highly resilient, and can dive to great depths—up to one mile below the surface—in search of food. So, do these deep-diving, mythical creatures need more sleep?
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What You'll Learn
Excessive daytime sleepiness (EDS)
EDS is characterised by periods of drowsiness every three or four hours, which usually end in short naps. People may sleep during the day for a few minutes, especially if they are in an awkward position, or for a few hours if lying down. People with narcolepsy often underestimate the duration of their drowsy periods and may not recall their behaviour during that time.
EDS can be described as an irresistible daytime need for naps, which generally refresh the person. However, the severity of sleepiness varies among individuals. Sleepiness in narcolepsy is often like a "sleep attack", where an overwhelming feeling of sleepiness comes on quickly. In between sleep attacks, individuals can have normal levels of alertness, particularly if they are doing activities that keep their attention.
Narcolepsy is a chronic neurological disorder that affects the brain's ability to control sleep-wake cycles. It is a manageable condition, and people with narcolepsy can lead full and rewarding lives. However, it can greatly affect daily activities, and if left untreated, it can interfere with emotional well-being, social interactions, and the ability to think clearly.
There are several treatments for EDS, including medications and lifestyle changes. Medications such as wake-promoting agents (e.g. modafinil, armodafinal, and solriamfetol) are typically the first choice for treatment as they are less addictive and have fewer side effects than previously used stimulants. For most people, these drugs effectively reduce daytime drowsiness and improve alertness. Amphetamine-like stimulants (e.g. methylphenidate) may be prescribed if modafinil is not effective.
Lifestyle changes can also help manage EDS. These include taking short naps, maintaining a regular sleep schedule, avoiding caffeine and alcohol before bed, and exercising regularly. Cognitive behavioural therapy (CBT) can also help people with narcolepsy sleep better and feel less sleepy during the day.
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Cataplexy
The diagnosis of narcolepsy and cataplexy is usually made by symptom presentation. The tetrad of symptoms (excessive daytime sleepiness, sleep-onset paralysis, hypnagogic hallucinations, and cataplexy symptoms) is strong evidence of narcolepsy. A multiple sleep latency test is often conducted to quantify daytime sleepiness.
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Sleep paralysis
The treatment for sleep paralysis is often focused on managing the underlying cause, such as narcolepsy or another sleep disorder. Medications and lifestyle changes can help improve sleep quality and reduce the frequency and impact of sleep paralysis episodes. Maintaining a consistent sleep schedule, creating a comfortable sleep environment, and avoiding stimulants before bed are recommended strategies to improve sleep quality and potentially reduce the occurrence of sleep paralysis.
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Hypnagogic hallucinations
The exact cause of hypnagogic hallucinations is unknown, but they may be triggered by increased stress, sleep deprivation, or certain medications. They are more common in people with sleep disorders like narcolepsy, insomnia, and excessive daytime sleepiness, as well as mental health disorders. While they are generally harmless, they can be distressing and disrupt sleep. In such cases, improving sleep hygiene, practising stress relief techniques, and consulting a doctor can help manage them.
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Sleep-wake cycles
Narcolepsy is a chronic neurological disorder that affects the brain's ability to control these sleep-wake cycles. People with narcolepsy may feel rested after waking but then feel very sleepy throughout much of the day. This is known as Excessive Daytime Sleepiness (EDS). In people with narcolepsy, the regulation of the sleep-wake cycle is disrupted, with the boundaries between wakefulness and sleep becoming blurred.
To manage their condition, people with narcolepsy are advised to maintain a regular sleep schedule, aiming for around eight hours of sleep each night. Taking short naps of 15–20 minutes during the day can also help to improve alertness. However, napping longer than 40 minutes can disrupt the onset of sleep in the evening. It is important to note that individual recommendations may vary, and it is best to consult a sleep specialist to determine the right sleep and nap schedule.
In addition to maintaining a consistent sleep schedule, other behavioural strategies for managing narcolepsy include avoiding caffeine and alcohol before bed, regular exercise, and a healthy diet. Medications are also often used in conjunction with behavioural strategies to improve alertness and manage symptoms such as cataplexy.
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Frequently asked questions
Narwhals sleep in short bursts and continue to swim while sleeping. They don't have a set "schedule" for their waking hours. They sleep when they are tired.
I couldn't find a definitive answer, but it seems that narwhals sleep a similar amount to other whales.
Again, I couldn't find a direct comparison, but it seems that narwhals sleep a similar amount to other sea creatures, such as dolphins.
