Spontaneous episodes of “paradoxical” sleep are plentiful in the rabbit adapted to its surroundings. The phenomenon is almost completely inhibited during 24 hours of noise which does not prevent ordinary sleep with spindles and slow waves. Following the masking noise period the animal recovers the missing paradoxical sleep episodes, indicating that the latter may be of fundamental physiological importance.
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Khazan et al. (1963) studied this question.