Eeg And Sleep Physiology Ppt [updated] [2027]

Sleep is a dynamic, active biological process essential for human survival, cognitive function, and metabolic health. Far from a state of simple inactivity, the sleeping brain undergoes highly organized, predictable cycles of electrical and physiological activity.

Disappearance of the alpha rhythm, replaced by low-amplitude, mixed-frequency (LAMF) activity, predominantly in the theta band (4–7 Hz).

A healthy night of sleep consists of 4 to 6 cycles, each lasting roughly 90 to 120 minutes. These cycles shift between Non-Rapid Eye Movement (NREM) and Rapid Eye Movement (REM) sleep. A is the graph that charts these cyclic transitions across the night. Early Night: Dominated by deep, slow-wave NREM sleep. Late Night: Dominated by longer, more intense REM episodes. 4. EEG Stages of Sleep (AASM Criteria) eeg and sleep physiology ppt

NREM is subdivided into three stages (formerly four, with Stages 3 & 4 now combined as ):

NREM sleep is split into three stages, representing progressively deeper sleep. Sleep is a dynamic, active biological process essential

This consolidated table serves as an excellent quick-reference slide for a presentation layout. Sleep Stage Primary EEG Frequency Landmark Waveforms Eye Movements (EOG) Muscle Tone (EMG) Alpha (8–12 Hz) Sinusoidal Alpha Blinking / Voluntary High / Active N1 (Light NREM) Theta (4–7 Hz) Vertex Sharp Waves Slow, Rolling N2 (Intermediate) Sleep Spindles & K-Complexes Moderate-Low N3 (Deep NREM) Delta (0.5–2 Hz) High-Voltage Slow Waves Stage R (REM) Mixed / Beta Sawtooth Waves Rapid, Irregular Atonia (Absent) Clinical Relevance and Sleep Pathophysiology

Conditions like sleepwalking occur when a patient gets stuck between deep N3 sleep and wakefulness, creating a state of partial arousal. A healthy night of sleep consists of 4

Sleep is not a uniform state; it consists of complex, cyclic stages governed by two primary mechanisms: