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Autonomic responses

Awakenings and sleep stage modifications are not the only possible acute effects of noise on the sleep process itself. If in a similar population nocturnal awakenings can be provoked with peak noise levels of 55 dB(A) and above, disturbance of normal sleep sequence can be observed for peak noise levels between 45 and 55 dB(A). Thus, in order to protect noisesensitive people, the World Health Organization recommended the following noise limits inside the bedroom: mean level (LAeq,8h) of 30 dB and maximal level (LAmax) of 45 dB.