Noise exposure in the evening (19:00–23:00) and in the early morning hours (05:00–06:00) was significantly associated with sleep efficiency, whereas the other time windows reached only borderline significance.
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Associations of Various Nighttime Noise Exposure Indicators with Objective Sleep Efficiency and Self-Reported Sleep Quality: A Field Study.
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The sentences
Using estimated indoor noise instead of measured outdoor noise yielded similar results in terms of regression coefficients, but none of the associations was even close to significance ( Table 4 ).