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Effects of personal control over hospital noise on sleep
1School of Nursing, University of Colorado, Denver.
Critical Care Unit (CCU) sound levels, subjective stress due to noise, and sleep were studied in 105 female volunteers in a simulated hospital environment. Subjects were randomly assigned to instruction in personal control over noise via the availability of a sound conditioner, no instruction in personal control over noise, or quiet conditions. Subjects in the two noise conditions heard audiotape-recorded CCU nighttime sounds while attempting to sleep overnight in the laboratory. The intervention did not facilitate better sleep as measured by polysomnograph equipment and self-report. However, the results provided strong support for a causal relationship between CCU sounds and poorer sleep. When compared to the quiet condition, subjects in the noise conditions had poorer sleep efficiency; more difficulty falling and staying asleep; more difficulty progressing from one stage of sleep to the next; more intrasleep awakenings; spent less time in Rapid Eye Movement sleep; and poorer sleep via self-report (all ps less than .03). As predicted, scores for subjective stress due to CCU sounds yielded significant relationships with 9 of 16 measures of sleep (all ps less than .01). Hierarchical multiple regressions showed that 13% (p less than .001) and close to 6% (p less than .05) of the variance in sleep efficiency was accounted for by CCU sound levels and noise-induced subjective stress, respectively. Thirty-eight percent (p less than .001) of the variance in Rapid Eye Movement sleep was accounted for by CCU sound levels.
Critical Care Unit (CCU) sound levels, subjective stress due to noise, and sleep were studied in 105 female volunteers in a simulated hospital environment. Subjects were randomly assigned to instruction in personal control over noise via the availability of a sound conditioner, no instruction in personal control over noise, or quiet conditions. Subjects in the two noise conditions heard audiotape-recorded CCU nighttime sounds while attempting to sleep overnight in the laboratory. The intervention did not facilitate better sleep as measured by polysomnograph equipment and self-report. However, the results provided strong support for a causal relationship between CCU sounds and poorer sleep. When compared to the quiet condition, subjects in the noise conditions had poorer sleep efficiency; more difficulty falling and staying asleep; more difficulty progressing from one stage of sleep to the next; more intrasleep awakenings; spent less time in Rapid Eye Movement sleep; and poorer sleep via self-report (all ps less than .03). As predicted, scores for subjective stress due to CCU sounds yielded significant relationships with 9 of 16 measures of sleep (all ps less than .01). Hierarchical multiple regressions showed that 13% (p less than .001) and close to 6% (p less than .05) of the variance in sleep efficiency was accounted for by CCU sound levels and noise-induced subjective stress, respectively. Thirty-eight percent (p less than .001) of the variance in Rapid Eye Movement sleep was accounted for by CCU sound levels.