Sleep Stage | Description | EEG waveform |
| · Awake and alert | Beta |
| · Awake and eyes closed | Alpha |
Stage N1 | · Light sleep · Slow heartbeat, breathing, eye movements · Relax muscles · Slow brain waves | Alpha, Theta (5) |
Stage N2 | · Deeper sleep · Descend Body temperature · Stop eye movement · Slow brain wave activity | Alpha, Theta spindle waves, K complexes (5) |
Stage N3 | · Deepest non-REM sleep · Lowest heartbeat and breathing · Slower brain wave activity | Delta, spindle waves (5) |
REM | · Dreaming · Faster and irregular breathing · Increase heart rate and blood pressure · Temporary paralyzed muscle | Delta (5) |