10 20 30 40 50 60 70 80 90 100 110 120

dBA—Indoors-Brief Sounds (Under 3 Minutes)

FIG. 6.3.4 Effects of brief noise on sleep. (Reprinted from J.D. Miller, 1971, U.S. Environmental Protection Agency Publication No. NTID 300.7 [Washington, DC: U.S. Government Printing Office].)

minute sound at each A-weighted sound level (dBA) or lower. This curve is based on data from 350 persons, tested in their own bedrooms. These measures were made between 2:00 and 7:00 A.M. Most of the subjects were probably roused from a light sleep.

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