EEG: K complex
A sharp, negative EEG wave followed by a high-voltage slow wave. The complex duration is at least 0.5 seconds and may be accompanied by a sleep spindle. K complexes occur spontaneously during non-REM sleep, and begin and define stage 2 sleep. They are thought to be evoked responses to internal stimuli. They can also be elicited during sleep by external (particularly auditory) stimuli.*
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*Reprinted with permission from: Culebras, Antonio Clinical Handbook of Sleep Disorders Hardcover © 1996 Butterworth-Heinemann