A stage of non-REM sleep
that occurs at sleep onset or that follows arousal from sleep stages 2, 3, 4, or
REM. It consists of a relatively low-voltage EEG with mixed frequency, mainly theta activity and alpha activity of less than 50% of the
scoring epoch. It contains EEG
vertex waves and slow rolling eye movements; no sleep spindles, K complexes, or REMs. Stage 1 normally
represents 4-5% of the major sleep episode.*
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*Reprinted with permission from: Culebras, Antonio Clinical Handbook
of Sleep Disorders Hardcover © 1996 Butterworth-Heinemann
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