The Benefits of White Noise for Sleep Improvement
Undisturbed sleep is crucial for both health and overall quality of life. The World Health Organization estimates that nearly 25% of the population experiences sleep disturbances due to environmental noise. Sleep disturbance associated with elevated noise levels is particularly prevalent in metropolitan areas.
Spectrum of white noise
A study was conducted to evaluate the effectiveness of white noise in improving sleep in high noise environments. The study employed a within-subject, ABA design, consisting of a baseline, treatment phase, followed by another baseline (washout) period. Each phase lasted one week, during which noise level and sleep were assessed.
Study Design and Participants
- Participants: Ten adult participants were recruited from a New York City based sleep clinic.
- Inclusion Criteria: Participants reported sleep disturbance and high levels of environmental noise in their sleep environment.
- Treatment: The application of a white noise device (Dohm Classic by Marpac, LLC) in the participants' bedroom.
Methodology
Sleep parameters were measured subjectively using the Consensus Sleep Diary. The treatment consisted of the application of a white noise device (Dohm Classic by Marpac, LLC) in the participants' bedroom.
The study was conducted using a within-subject, ABA design, with baseline, treatment phase, followed by another baseline (washout) period. Each phase lasted one-week, during which noise level and sleep were assessed.
Results
Paired sample t-tests were conducted to evaluate the hypothesis that white noise improves sleep in a high noise environment. Significance was found on the variables WASO, as measured by actigraphy, t(9) = 3.438, p = 0.007 and sleep latency as measured by sleep diary, t(9) = 2.947, p = 0.016.
Our data show that white noise significantly improved sleep based on subjective and objective measurements in subjects complaining of difficulty sleeping due to high levels of environmental noise.
Key Findings
The study demonstrated that white noise can significantly improve sleep quality in individuals exposed to high levels of environmental noise. This improvement was observed through both subjective sleep diary entries and objective actigraphy measurements.
Significant Improvements:
- WASO (Wake After Sleep Onset): Reduced, indicating more consolidated sleep.
- Sleep Latency: Decreased, showing faster onset of sleep.
Distribution of sleep latency in participants with insomnia and normal controls
Data show that white noise significantly improved sleep based on subjective and objective measurements in subjects complaining of difficulty sleeping due to high levels of environmental noise.
Supporting Research
Undisturbed sleep has been shown to be important for both health and quality of life (Medic et al. [7]). The World Health Organization estimates that nearly 25% of the population suffers from disturbed sleep due to environmental noise (Health TWECfEa, [2]).