The slowest type of EEG wave which is about 1 Hz that characterizes stage 3 sleep.

University of Rochester

NREM3. Defined by presence of large amplitude, very slow delta waves. Often bundled with stage 4 of sleep due to their similarities and called slow-wave sleep. These slow waves represent widespread cortical activity synchronization. 
- Delta wave
- Night terror

Stage 3 of non-REM sleep

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

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