The key finding
A 2024 review of ten studies examining sleep quality in intensive care units found that combining pharmacologic and nonpharmacologic interventions offers the most effective approach to improving patient sleep. Among nonpharmacologic strategies, earplugs and sleep masks emerged as the simplest interventions to implement. The review, published in Critical Care Nurse, analyzed 159 articles to identify evidence-based approaches for addressing the widespread sleep disruption that ICU patients face due to environmental noise, frequent medical interventions, and alarm sounds throughout the night.
What the study looked like
Researchers conducted an integrative literature review by searching four major medical databases—CINAHL, PubMed, Cochrane Library, and MEDLINE—in April and May 2023. They used keywords including “intensive care units,” “promotion,” “sleep quality,” and “sleep” to identify relevant studies. From 159 articles initially identified, only 10 met the quality criteria for inclusion in the final analysis. The researchers used the Critical Appraisal Skills Programme tool to assess each study’s methodological rigor. The findings were organized into four thematic categories: consequences of poor sleep quality, factors affecting sleep quality, pharmacologic interventions, and nonpharmacologic interventions. The review synthesized evidence from various study designs examining ICU patients across different age ranges and clinical conditions.
Why researchers think this happened
ICU environments present multiple challenges to normal sleep patterns. Patients are exposed to constant noise from medical equipment alarms, frequent nighttime interruptions for monitoring and treatments, artificial lighting that disrupts circadian rhythms, and the stress of critical illness itself. The research team found that these factors combine to create a hostile environment for restorative sleep. Nonpharmacologic interventions work by addressing these environmental barriers directly: earplugs reduce noise exposure, sleep masks block disruptive light, and protocols that cluster care activities minimize nighttime interruptions. Relaxation techniques like aromatherapy, music therapy, and acupressure may help by reducing anxiety and promoting physiological relaxation. The researchers noted that combining approaches addresses multiple sleep disruptors simultaneously, which likely explains why multimodal strategies appear more effective than single interventions.
How to read this carefully
This was a literature review rather than a primary research study, meaning the authors synthesized existing research rather than conducting new experiments. Only 10 studies from 159 initially identified met quality standards, suggesting the evidence base remains limited. The review did not specify the sample sizes, populations, or methodological designs of included studies in the abstract, making it difficult to assess how robust the underlying evidence is. Importantly, “most effective” does not mean these interventions guarantee improved sleep for every ICU patient—individual responses vary based on illness severity, medications, and personal factors. The simplicity of earplugs and masks doesn’t necessarily mean they’re the most powerful interventions, just the easiest to implement. Readers should note this review reflects research available through May 2023 and doesn’t establish causation between specific interventions and sleep outcomes.
What this means for everyday life
While this research focuses on critically ill patients, it offers insights relevant beyond ICU walls. The finding that environmental factors—noise, light, and interruptions—significantly disrupt sleep applies to everyday life as well. If you or a loved one faces hospitalization, it might be worth discussing sleep protection strategies with healthcare providers, such as requesting clustered nighttime care when medically appropriate. The emphasis on simple, low-cost interventions like earplugs and eye masks suggests these tools may benefit anyone struggling with sleep in noisy or bright environments, from shift workers to urban apartment dwellers. The success of multimodal approaches in ICUs hints that addressing multiple sleep disruptors simultaneously—perhaps combining room darkening, white noise, and relaxation techniques—may be more effective than relying on a single strategy. For those supporting hospitalized family members, advocating for attention to sleep quality as part of recovery care might be worth considering.