A 14-18 Hz wave that appears in bursts during stage 2 sleep.

University of Rochester

This is the second stage of NREM sleep. Many people deny the fact that they were asleep when awakened during the first two stages of sleep.
- Sleep spindle
- K complex

Stage 2 of non-REM sleep

Breedlove, S. & Watson, N. (2017). Behavioral neuroscience, eighth edition. Oxford University Press.

Behavioral Neuroscience 8th Edition

Sleep spindle

A K-complex is a very high-amplitude pattern of brain activity observed on an EEG during Stage 2 of NREM sleep, visually distinguished by its significantly high amplitude and longer wavelength. It can occur as a reaction to environmental stimuli and is thought to serve as a bridge to higher levels of arousal. K-complexes are also involved in sleep maintenance and memory consolidation.

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