Sharp wave patterns that appear during stage 1 of sleep.

University of Rochester

This is the first stage of NREM sleep. People show slow heart rate and reduced muscle tension during this stage. As drowsiness begins, the time spent in alpha rhythm decreases and the EEG shows waves with much smaller amplitude and irregular frequency. Vertex spikes also appear
- Vertex spike

Stage 1 of non-REM sleep

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

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