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sleep disorders medicine: sleep stage 4 (non-REM stage 4)


All statements concerning non-REM sleep stage 3 apply to stage 4 except that high voltage, EEG slow waves persist in 50% or more of the epoch; non-REM sleep stage 4 usually represents12-15% of total sleep time. Sleepwalking, sleep terrors, and confusional arousal episodes generally start in stage 4 or during arousals from this stage. See Sleep Stage 3.*

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*Reprinted with permission from: Culebras, Antonio Clinical Handbook of Sleep Disorders Hardcover © 1996 Butterworth-Heinemann



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