Abstract
The pupil is wider and the nictitating membrane is more retracted in the stage of sleep characterized by a low voltage electrocorticogram than in sleep with slow waves and spindles. The infrapalpebral events suggest an increased sympathetic activity, probably humoral in nature, which may help account for some of the variations in autonomic neuroeffector systems and the persistent electrocortical desynchronization typical of this stage of sleep.
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