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Figure 15. Average variation of sleep factors for different population samples as a result of the exposure to night-time road traffic noise. : Total reaction; : one week reaction, and : spontaneous reaction. After (Griefahn and Gros, 1986).

Figure 15. Average variation of sleep factors for
different population samples as a result of the
exposure to night-time road traffic noise.
: Total reaction; : one week reaction, and
: spontaneous reaction. After (Griefahn and
Gros, 1986).