NREM
2021-11-28 links: Sleep reference:
NREM #
- NREM 1: Extremely light stage of sleep. Brainwaves begin to go from Alpha waves to Theta waves. Sometimes you don’t even realize you were asleep if woken up from this state. This is when ‘hypnic jerks’ occur.
- NREM 2: Still quite light. Brainwaves are in Theta waves frequency, exhibiting sleep spindles (burst of fast waves, which last for <1s) and K-complexes (single long delta wave that lasts ~1s).
- NREM 3/4: Delta waves. Very hard to wake up during this stage.
- (Stage 3 can be split into two separate stages, 4 is when >50% of Neural Oscillations are delta waves. Most of the time, this is the case.)