Neurology diagnoses and treats disorders of the nervous system, including the brain, spinal cord, and nerves, as well as thought and memory.
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The hallmark symptom of neurological sleep disorders is excessive daytime sleepiness (EDS) that is irrepressible. Unlike the fatigue of anemia or depression, which is a lack of energy, neurological EDS is a physiological inability to stay awake. Patients describe “sleep attacks” where they fall asleep during active tasks like eating or talking, not just when bored.
Sleep inertia, or “sleep drunkenness,” is particularly profound in Idiopathic Hypersomnia. Patients may require extreme measures to wake up, such as multiple alarms or physical assistance, and may remain confused and disoriented for hours. This reflects a failure of the brain’s arousal systems to engage fully upon transition from sleep to wake.
Neurological sleep disorders often manifest as a dissociation between sleep stages, where features of REM sleep intrude into wakefulness. Cataplexy is the most specific symptom of Narcolepsy Type 1. It is a sudden, transient loss of muscle tone triggered by strong emotions, usually positive ones like laughter, surprise, or joking.
Sleep paralysis and hypnagogic hallucinations are other examples of this dissociation. In sleep paralysis, the mind wakes up, but the body remains in the atonic (paralyzed) state of REM. Hallucinations can be visual, auditory, or tactile and often occur at the boundary of sleep, featuring frightening images or a sense of a presence in the room.
In REM Sleep Behavior Disorder (RBD), the normal paralysis that protects the sleeper is lost. Patients act out their dreams, which are often violent or defensive in nature. This can result in punching, kicking, yelling, or leaping out of bed, posing a significant risk of injury to the patient and their bed partner.
Restless Legs Syndrome (RLS) and Periodic Limb Movement Disorder (PLMD) involve involuntary movements that disrupt sleep continuity. RLS is a sensory motor disorder characterized by an urge to move the legs, usually accompanied by uncomfortable sensations like creeping or crawling, which worsen at rest and at night.
When the internal clock is desynchronized from the external environment, patients experience a mismatch in alertness. In Advanced Sleep Phase, common in older adults, patients wake up at 3 or 4 AM and cannot return to sleep, but struggle to stay awake past 7 PM. In Delayed Sleep Phase, typical of teens, the cycle is shifted much later.
Non 24 Hour Sleep Wake Disorder is a condition primarily affecting blind individuals who lack light perception. Without the daily reset signal of light, their internal clock runs slightly longer than 24 hours, causing their sleep time to drift later by one or two hours every day, cycling in and out of phase with society.
Narcolepsy Type 1 is strongly linked to specific genetic markers. The presence of the HLA-DQB1*06:02 allele is a major risk factor, found in almost all patients with classic narcolepsy. It is believed that in genetically susceptible individuals, an environmental trigger (like the flu or a streptococcal infection) sparks an autoimmune attack on the orexin producing neurons.
For REM Sleep Behavior Disorder, the primary risk factor is the presence of a synucleinopathy. The conversion rate is high; the majority of men over 50 diagnosed with idiopathic RBD will develop Parkinson’s disease, Lewy Body Dementia, or Multiple System Atrophy within 10 to 15 years.
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Neurology
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Spec. MD. Hatice Çil
Neurology
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Asst. Prof. MD. Yavuz Bekmezci
Neurology
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MD. Hatice Yelda Yıldız
Neurology
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Prof. MD. Belma Doğan Güngen
Neurology
Liv Hospital Bahçeşehir
Spec. MD. Merve Hilal Dolu
Pediatric Neurology
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Spec. MD. Sevıl Yusıflı
Neurology
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Spec. MD. Yasemin Giray
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Assoc. Prof. MD. Figen Yavlal
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Spec. MD. Güneş Altıokka Uzun
Neurology
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Assoc. Prof. MD. Hatice Balaban
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Asst. Prof. MD. Özlem Aksoy Özmenek
Neurology
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Spec. MD. Filiz Ökten Özyüncü
Neurology
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Spec. MD. EFTAL GÜRSES SEVİNÇ
Neurology
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Prof. MD. Ömer Faruk Aydın
Pediatric Neurology
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Spec. MD. Hikmet Dolu
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MD. AZER QULUZADE
Neurology
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Spec. MD. STEVAN TEKIC
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Neurology
Psyc. Selin Ergeçer
Stroke Center
Liv Hospital Ulus + Liv Hospital Vadistanbul
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Pediatric Neurology
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Neurology
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It feels like sudden weakness; your knees might buckle, your jaw might go slack, or you might drop what you are holding, but you remain fully awake and aware the whole time.
Yes, REM Sleep Behavior Disorder is considered one of the strongest early warning signs (prodrome) for developing Parkinson’s disease or Lewy Body Dementia later in life.
Yes, severe traumatic brain injury can damage the hypothalamus or the cells that produce orexin, leading to a condition called secondary narcolepsy.
SSRIs and other antidepressants alter serotonin levels, which can inhibit the dopamine pathways in the spinal cord that regulate sensory input, triggering or worsening restless legs.
Yes, it is an extremely rare genetic prion disease where the thalamus degenerates, preventing the brain from entering deep sleep, leading to progressive insomnia and eventually death.
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