A 32-year-old man comes to the physician complaining of excessive sleepiness for the past several months. He reports falling asleep while dealing with customers and had a near accident when he fell asleep while driving. The patient reports that he occasionally hears voices while falling asleep and finds himself "temporarily frozen" and unable to move upon awakening. Which of the following is the most appropriate treatment for this patient?

Continuous positive airway pressure

In narcolepsy, the polysomnographic recording typically shows which of the following patterns?

REM intrusion during inappropriate periods

An absence of REM sleep in midcycle

A 49-year-old man presents with a 10-year history of increasing knee and hip pain, exacerbated by end-of-day activity. Over the past year, he has developed increasing drowsiness at work and his wife reports he is a severe snorer. For the last month, he has experienced episodes of sharp, colicky, right upper abdominal pain. His physical examination reveals a temperature of 37°C, pulse of 82/min, respirations of 10/min, and blood pressure of 140/85 mm Hg. He is 175 cm tall and weighs 156 kg (BMI 51). Laboratory findings include glucose of 139 mg/dL, HbA1c of 10%, total cholesterol of 229 mg/dL, and HDL cholesterol of 33 mg/dL. Arterial blood gas measurements show pH 7.35, PCO2 50 mm Hg, and PO2 75 mm Hg. Which of the following additional conditions is most likely present in this man?

Nonalcoholic fatty liver disease

The Epworth questionnaire is used in the assessment of which condition?

Obstructive sleep apnea syndrome

Hypersomnias for INI-CET: High-Yield Internal Medicine Lessons

Hypersomnias - Sleepy Saga Starts

Excessive Daytime Sleepiness (EDS): Inability to stay awake/alert during major waking episodes, resulting in unintended sleep.

⭐ Excessive Daytime Sleepiness (EDS) is the cardinal symptom of all hypersomnias.
ICSD-3 Central Disorders of Hypersomnolence:
- Narcolepsy (Type 1 & 2)
- Idiopathic Hypersomnia
- Kleine-Levin Syndrome
- Hypersomnia due to medical/psychiatric disorder or substance
- Insufficient Sleep Syndrome
Types:
- Primary: CNS origin (e.g., Narcolepsy, Idiopathic Hypersomnia).
- Secondary: Due to other medical/psychiatric conditions, drugs, or insufficient sleep syndrome (most common).

Hypersomnias - Sudden Snooze Fest

Hypersomnias: Conditions characterized by Excessive Daytime Sleepiness (EDS) not due to insufficient sleep or circadian rhythm disorders.
Narcolepsy: Primary hypersomnia.
- Type 1: EDS + Cataplexy (sudden, brief loss of muscle tone triggered by emotions). Associated with low CSF hypocretin-1 levels.
- Type 2: EDS without cataplexy. Normal CSF hypocretin-1 levels.
Symptoms 📌 CHESS pentad:
- Cataplexy (esp. Type 1)
- Hallucinations (hypnagogic/hypnopompic)
- Excessive Daytime Sleepiness (EDS)
- Sleep Paralysis
- Sleep Disruption (fragmented nocturnal sleep)
Diagnosis:
- Polysomnography (PSG): Rules out other sleep disorders (e.g., sleep apnea).
- Multiple Sleep Latency Test (MSLT): Done day after PSG.
  - Mean sleep latency ≤8 minutes.
  - ≥2 Sleep Onset REM Periods (SOREMPs) (one SOREMP can be from preceding PSG).

⭐ Narcolepsy Type 1 is strongly associated with HLA-DQB1*06:02 and low CSF hypocretin-1 levels.

Management:
- Pharmacological: Modafinil/Armodafinil, Solriamfetol, Pitolisant for EDS. Sodium oxybate for cataplexy, EDS, and disrupted sleep. Antidepressants (TCAs, SSRIs, SNRIs) for cataplexy.
- Behavioral: Scheduled naps, good sleep hygiene.

Hypersomnias - Other Sleepy Syndromes

Feature	Narcolepsy Type 2	Idiopathic Hypersomnia (IH)	Kleine-Levin Syndrome (KLS)
EDS	Yes	Yes (persistent, severe; sleep inertia common)	Yes (episodic, ~2-10 times/year, lasting days-weeks)
Cataplexy	No	No	No
MSLT	Mean sleep latency ≤8 min, ≥2 SOREMPs	Mean sleep latency ≤8 min, <2 SOREMPs	Normal inter-episode; during episode often non-diagnostic
Other Key Features	-	Prolonged nocturnal sleep (≥10 hrs), unrefreshing naps	Recurrent hypersomnia + cognitive/behavioral disturbances (megaphagia, hypersexuality, derealization). Adolescent male predominance.
Management	Stimulants (Modafinil), Sodium oxybate	Stimulants (Modafinil), Flumazenil (off-label)	Supportive; Lithium (prophylaxis), Stimulants (symptomatic)

Hypersomnias - The Why of Yawn

Characterized by Excessive Daytime Sleepiness (EDS).

Diagnostic Approach:
- Detailed history, sleep diary.
- Epworth Sleepiness Scale (ESS): score >10 indicates significant EDS.
- Actigraphy for sleep-wake patterns.
- Polysomnography (PSG) & Multiple Sleep Latency Test (MSLT) for objective confirmation and specific diagnosis (e.g., narcolepsy, idiopathic hypersomnia).
Common Secondary Causes:
- Insufficient Sleep Syndrome (ISS) - 📌 Most common, check sleep hygiene!
- Sleep-Related Breathing Disorders (e.g., Obstructive Sleep Apnea - OSA).
- Psychiatric conditions (e.g., depression).
- Medications (e.g., sedatives, beta-blockers).
- Medical conditions (e.g., hypothyroidism, anemia, neurological disorders).

⭐ Insufficient sleep syndrome is a common cause of EDS and is diagnosed by history and improvement with extended sleep; it's a diagnosis of exclusion after ruling out other sleep disorders.

Algorithm for evaluating Excessive Daytime Sleepiness

High‑Yield Points - ⚡ Biggest Takeaways

Narcolepsy Type 1: cataplexy & low CSF hypocretin-1.

Narcolepsy Type 2: no cataplexy, normal CSF hypocretin-1.

Idiopathic Hypersomnia: EDS despite long sleep; sleep inertia common.

Kleine-Levin Syndrome: recurrent hypersomnia, cognitive/behavioral issues; mainly adolescent males.

MSLT (narcolepsy): latency ≤8 min, ≥2 SOREMPs. IH: latency ≤8 min, <2 SOREMPs.

Modafinil/Armodafinil: first-line for EDS in narcolepsy/IH.

Sodium oxybate: treats cataplexy, EDS, disrupted sleep in narcolepsy_._

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Hypersomnias