A client in the ICU has been frequently awakened every 1-2 hours for vital signs and treatments over the past 4 nights. The client now appears confused, irritable, and reports vivid, unsettling dreams during brief periods of sleep. The nurse recognizes these findings are most consistent with which phenomenon?
- AREM rebound from repeated interruption of REM sleep cycles
- BNormal sundowning associated with hospitalization
- CExpected sedative medication withdrawal syndrome
- DEarly signs of a new intracranial hemorrhage
Show answer & explanationAnswer & explanation
Correct answer: A. REM rebound from repeated interruption of REM sleep cycles
Frequent interruptions prevent the client from reaching restorative REM sleep, leading to REM deprivation; when REM sleep does occur, it can be more intense (REM rebound), and prolonged deprivation causes irritability, confusion, and vivid dreaming. Sundowning refers to increased confusion in the evening for clients with dementia, not sleep interruption; there is no indication of sedative withdrawal or acute neurologic bleed, though the nurse should still rule out other causes if symptoms worsen.
Why the other options are wrong
- B. Sundowning is specific to dementia-related evening confusion, not sleep fragmentation.
- C. No information suggests sedative use or withdrawal in this scenario.
- D. Symptoms described are classic for sleep deprivation, not acute neurologic bleeding, though further assessment is prudent if new focal deficits appear.
REM Sleep Deprivation / REM Rebound
Frequent sleep interruptions prevent completion of REM sleep cycles; prolonged REM deprivation causes irritability, disorientation, and vivid/intense dreaming when REM sleep is finally achieved (REM rebound).
- REM sleep is essential for cognitive restoration
- ICU patients are at high risk due to frequent monitoring
- Nurses should cluster care to protect sleep cycles
Memory trick: "Interrupt REM, and the mind gets grim."