A 17-year-old man presents to his primary care physician concerned about excessive sleepiness that has persisted his entire life. He notes that he has been having difficulty with his job as a waiter because he often falls asleep suddenly during the day. He also experiences a sensation of dreaming as he goes to sleep even though he still feels awake. He sleeps about 10 hours per day and still feels tired throughout the day. The patient has even reported driving into a tree once as he fell asleep while driving. The patient often stays up late at night working on the computer. Physical exam demonstrates an obese young man who appears tired. His oropharynx demonstrates high palatal ridges and good dental hygiene. Which of the following is the best next step in management?

Order sleep study with Multiple Sleep Latency Test

Recommend scheduling regular naps and more time for sleep at night

Start a selective serotonin reuptake inhibitor

Begin inhibitor of dopamine reuptake

Continuous positive airway pressure at night

A 23-year-old man presents with fatigue and increased daytime somnolence. He says his symptoms began gradually 6 months ago and have progressively worsened and have begun to interfere with his job as a computer programmer. He is also bothered by episodes of paralysis upon waking from naps and reports visual hallucinations when falling asleep at night. He has been under the care of another physician for the past several months, who prescribed him the standard pharmacotherapy for his most likely diagnosis. However, he has continued to experience an incomplete remission of symptoms and has been advised against increasing the dose of his current medication because of an increased risk of adverse effects. Which of the following side effects is most closely associated with the standard drug treatment for this patient’s most likely diagnosis?

Cardiac irregularities, nervousness, hallucinations

Weight gain and metabolic syndrome

Parkinsonism and tardive dyskinesia

Loss of concentration, memory impairment

A 37-year-old male presents to general medical clinic reporting sleeping difficulties. He states that he has daytime sleepiness, having fallen asleep several times while driving his car recently. He sometimes experiences very vivid dreams just before awakening. You ask the patient's wife if she has witnessed any episodes where her husband lost all muscle tone and fell to the ground, and she confirms that he has not had this symptom. The patient notes that this condition runs in his family, and he desperately asks for treatment. You begin him on a first-line medication for this illness, which works by which mechanism of action?

Alpha-2 adrenergic receptor antagonism

A 28-year-old man is brought to the emergency department after he was found half dressed and incoherent in the middle of the road. In the emergency department he states that he has not slept for 36 hours and that he has incredible ideas that will make him a billionaire within a few months. He also states that secret agents from Russia are pursuing him and that he heard one of them speaking through the hospital intercom. His past medical history is significant only for a broken arm at age 13. On presentation, his temperature is 102.2°F (39°C), blood pressure is 139/88 mmHg, pulse is 112/min, and respirations are 17/min. Physical exam reveals pupillary dilation and psychomotor agitation. Which of the following mechanisms is most likely responsible for this patient's symptoms?

Increased biogenic amine release

N-methyl-D-aspartate receptor antagonist

Gamma-aminobutyric acid receptor agonist

Substance/medication-induced sleep disorders for USMLE Step 1: High-Yield Psychiatry Lessons

Core Concepts - The Sleep Hijack

A prominent, severe sleep disturbance (insomnia, hypersomnolence) directly caused by the physiological effects of a substance or medication, either during intoxication or withdrawal.
Diagnosis requires a clear temporal link between substance use and the onset, exacerbation, or remission of the sleep problem.
Common Culprits:
- Insomnia: Stimulants (caffeine, amphetamines), alcohol/sedative withdrawal.
- Hypersomnolence: Alcohol, opioids, or sedatives during intoxication.

⭐ Alcohol initially acts as a sedative but later causes sleep fragmentation and early awakenings as it is metabolized, leading to decreased total sleep time and REM suppression.

📌 A-B-C: Alcohol, Benzodiazepines, Caffeine are frequent offenders.

Causative Agents - The Usual Suspects

During Intoxication:
- Alcohol: Initially sedating, but disrupts sleep architecture, causing frequent awakenings.
- Stimulants: Amphetamines, cocaine, and caffeine directly antagonize sleep-promoting pathways, leading to insomnia.
- Cannabis: Acute use may be sedating, but chronic use is linked to difficulty falling and staying asleep.
- Opioids: Cause drowsiness but disrupt sleep cycles, potentially causing central sleep apnea.
During Withdrawal:
- Alcohol: Severe insomnia, vivid dreams, and autonomic hyperactivity.
- Sedatives/Hypnotics/Anxiolytics: (e.g., Benzodiazepines) Rebound insomnia and anxiety are hallmark features.
- Opioids: Insomnia, restlessness, and yawning.
- Stimulants: "Crash" phase characterized by hypersomnia and fatigue.
Common Medications:
- Antidepressants (SSRIs, SNRIs)
- Corticosteroids (Prednisone)
- Decongestants (Pseudoephedrine)
- Beta-blockers (can cause nightmares)

⭐ Alcohol initially suppresses REM sleep. As blood alcohol levels fall overnight, a "REM rebound" occurs, leading to fragmented sleep and early morning awakenings.

Diagnosis & Management - The Recovery Roadmap

Diagnosis: Primarily clinical, based on a detailed history establishing a temporal link between substance/medication use and sleep disturbance. Symptoms must be clinically significant and not better explained by another sleep or mental disorder.
- Tools: Urine toxicology screen confirms substance use. Polysomnography (PSG) can reveal specific sleep architecture changes but is not always required.
Management: The cornerstone is addressing the underlying substance use disorder (SUD).
- First-line: Cessation or tapering of the offending agent. Cognitive Behavioral Therapy for Insomnia (CBT-I) is highly effective.
- Pharmacotherapy: Use non-addictive agents for short-term relief. Avoid benzodiazepines.
  - Trazodone (50-100 mg)
  - Doxepin (low-dose)
  - Mirtazapine (if comorbid depression)

⭐ Exam Favorite: With chronic alcohol use, sleep disturbances, particularly suppressed REM and fragmented sleep, can persist for weeks to months even after achieving sobriety. This is a common reason for relapse.

High‑Yield Points - ⚡ Biggest Takeaways

Alcohol has a biphasic effect: initial sedation followed by REM suppression and sleep fragmentation.

Benzodiazepines & Z-drugs reduce sleep latency but suppress slow-wave and REM sleep, leading to poor sleep quality.

Stimulants (cocaine, amphetamines, caffeine) directly cause insomnia by increasing synaptic catecholamines.

While most antidepressants (SSRIs/SNRIs) can cause insomnia, trazodone is sedating and often used to treat it.

Chronic opioid use is strongly linked to central sleep apnea and reduced slow-wave sleep.

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