EEG and Sleep Physiology: A Comprehensive Guide to Recording and Understanding Sleep
According to the AASM (American Academy of Sleep Medicine), sleep is divided into N1, N2, N3 (NREM), and REM.
Waveform | Frequency (Hz) | Amplitude | Associated Clinical State -----------|----------------|-----------------|--------------------------------- Beta (β) | 13 – 30 Hz | Low (< 20 µV) | Active thinking, focus, eyes open Alpha (α) | 8 – 12 Hz | Medium (20-60µV)| Relaxed wakefulness, eyes closed Theta (θ) | 4 – 7 Hz | Variable | Light sleep (N1, N2), drowsiness Delta (δ) | 0.5 – 4 Hz | High (> 75 µV) | Deep sleep (N3 / Slow-Wave Sleep) Specialized Sleep Waveforms eeg and sleep physiology ppt
– Quick summary of the vital role EEG plays in understanding brain health during rest. 7. Conclusion
When awake, EEG readings show "activated" brain activity, dominated by low-voltage, fast-activity waves in the beta ( Hz) and gamma ( >30is greater than 30 Hz) range. B. NREM Sleep (Non-Rapid Eye Movement) EEG and Sleep Physiology: A Comprehensive Guide to
Characterised by rapid eye movements, muscle atonia (temporary paralysis), and vivid dreaming. Detection:
[Figure: A visual hypnogram showing descent from Wake to N1, N2, N3, then ascent to REM, repeating 4-5 times through the night] Conclusion When awake, EEG readings show "activated" brain
: Predominantly delta waves; critical for physical restoration.
EEG and Sleep Physiology: A Comprehensive Guide Electroencephalography (EEG) is the cornerstone of sleep medicine, providing the primary non-invasive method for monitoring brain electrical activity and identifying the distinct stages of human sleep. In clinical and research settings, understanding the physiological changes recorded by an EEG is essential for diagnosing sleep disorders and analyzing sleep architecture.
Placed on the submental (chin) muscle to record muscle tone/atonia.