Eeg And Sleep Physiology Ppt Page

The American Academy of Sleep Medicine (AASM) classifies sleep into four distinct stages based on EEG, EOG (eye movements), and EMG (muscle tone) readouts. Stage W (Wakefulness)

Electroencephalography (EEG) is the cornerstone of modern sleep medicine. By recording the brain's electrical activity, EEG allows scientists and clinicians to peer into the sleeping brain, mapping out distinct stages and identifying sleep disorders.

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 ppt

At least 20% of a 30-second epoch must consist of Delta waves ( ) with amplitudes

NREM sleep is split into three stages, representing progressively deeper sleep. The American Academy of Sleep Medicine (AASM) classifies

Marked by Sleep-Onset REM Periods (SOREMPs), where a patient bypasses NREM stages and drops directly into REM sleep within minutes of falling asleep. Presentation Design Tips for "EEG and Sleep Physiology"

Marked by repetitive pauses in breathing, leading to frequent cortical micro-arousals. On an EEG, this shows up as sudden shifts from deep sleep waves to fast alpha or beta frequencies, fracturing sleep architecture. When awake, EEG readings show "activated" brain activity,

Alpha waves drop below 50% of the epoch. They are replaced by low-amplitude, mixed-frequency theta waves (4–7 Hz). Vertex sharp waves may appear at the end of the stage. EOG: Slow, rolling eye movements. EMG: Muscle tone begins to decrease. Stage N2 (Stable NREM Sleep)

: This neurobiology explains how sedatives works and why neurological damage disrupts sleep.