The use of the electroencephalogram (EEG) is accepted as the only objective method of studying sleep. However, EEG sleep study may not be feasible, although it would be highly desirable, in some non‐laboratory operational environments due to difficulties in EEG recordings. Results of the present study showed that the ultradian delta rhythmicity of sleep as defined by EEG could be obtained from electro‐oculograms (EOGs) alone.
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Hilbert et al. (1972) studied this question.
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