A 6-Year-Old With Nighttime Waking and Confusional Events
A 6-year-old boy is brought for evaluation of nighttime events occurring 3-4 nights per week for 4 months. About 90 minutes after sleep onset he sits up, appears confused, is inconsolable, and pushes his parents away; events last 5-10 minutes and he has no memory of them. He shares a room with a younger sibling and is difficult to arouse the next morning. His mother has a history of sleepwalking as a child. Polysomnography shows a sleep efficiency of 88%, normal latency, no apnea (AHI 0.4), and one event arising from slow-wave sleep. Total sleep time on weeknights is 8 hours; on weekends he sleeps 10-11 hours and events are rare. Ferritin is 22 ng/mL.
1. What is the most likely diagnosis, and which features in the history support it over REM sleep behavior disorder and nocturnal seizures?
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Most likely diagnosis: NREM sleep parasomnia - confusional arousals (disorder of arousal), on a background of chronic insufficient sleep.
Supporting features:
- Timing: events arise ~90 minutes after sleep onset, during the first slow-wave sleep period - the classic window for disorders of arousal.
- Semiology: confused, inconsolable, autonomic arousal, no dream recall. RBD events are dream-enacting, purposeful, and recalled; they occur in REM (later in the night) and are rare in a 6-year-old without neurologic disease.
- PSG: the event arose from slow-wave (N3) sleep, not REM; no epileptiform activity.
- Family history: first-degree relative with sleepwalking strongly supports a genetic predisposition to disorders of arousal.
- Sleep debt: shorter weeknight sleep with weekend catch-up and fewer events when well rested is a hallmark trigger.
Nocturnal seizures would be considered if events were stereotyped, very brief, multiple per night, or had focal features; the PSG did not show epileptiform discharges.
2. The parents ask about pharmacotherapy. How do you counsel them, and what non-drug steps do you prioritize?
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Counseling: Reassure that confusional arousals are usually benign and self-limited, and that medication is reserved for dangerous, injurious, or highly disruptive events - not first-line here.
Priorities:
- Extend sleep: target 10-11 hours nightly for a 6-year-old. This is the single highest-yield intervention and often eliminates events.
- Safety: bedrails/floor padding, door alarms, avoid bunk beds, brief gentle redirection without vigorous awakening (which can prolong confusion).
- Trigger review: screen for illness/fever, noise, and bladder fullness; treat any obstructive sleep apnea (none here).
- Iron: ferritin 22 ng/mL is low-normal; check CBC and consider oral iron with recheck, since low iron has been associated with disorders of arousal and restless legs.
- Scheduled awakening can be tried if events are predictable.
If events persist despite sleep extension and are injurious, low-dose benzodiazepine or melatonin could be discussed, but this is not the current step.