Brain Waves and Sleep Stages Explained

• Beta - Active/Awake = (13–60 Hz): High frequency, low amplitude. Occurs during alert, active, or anxious waking consciousness.

• Alpha -  Relaxed/Meditating = (8–12 Hz): Relaxed wakefulness, meditating, or daydreaming with eyes closed.

• Theta - Sleep = (3–8 Hz): Occurs in Stage N1 (transition to sleep) and Stage N2 (light, consistent sleep).

• Delta - Restoring Sleep = (0.5–3 Hz): Slow, high-amplitude waves during Stage N3 (deep, restorative, slow-wave sleep). 

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Sleep Cycles

• Stage N1 (NREM 1): Transition from Alpha to Theta waves. Lightest sleep.

• Stage N2 (NREM 2): Dominated by Theta waves, plus sleep spindles and K-complexes (memory consolidation).

• Stage N3 (NREM 3): Deepest sleep, characterized by Delta waves. Crucial for physical repair.

• REM Sleep: Brainwaves become fast and desynchronous, similar to Beta/Alpha waves, accompanied by dreaming and muscle paralysis to keep you from acting out your dreams.