Abstract
The movements and fixations of the eyes give an objective indication of the sleeping or wakefulness of the visual centers. With the onset of sleep visual fixation disappears and quick (saccadic) movements change to a slow drifting movement which may persist for an indefinite time during sleep. The lids may remain open at the onset of sleep if the individual is striving to keep awake. The speed of saccadic movements is found to be much slower when a person is sleepy than when normally awake. Illustrative photographic records are shown and a bibliography given.

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