Deep, restorative sleep. Defined by Slow Wave Activity (SWA) consisting of delta waves (0.5–2 Hz) with a peak-to-peak amplitude
The transitions between wakefulness, NREM, and REM states are controlled by the interplay of several neurochemical systems.
The integration of EEG analysis with sleep physiology has transformed our understanding of the resting brain. From the transient sleep spindles of Stage N2 to the deep, restorative delta waves of Stage N3, the EEG provides an objective window into the sleeping mind. Mastering these waveforms and their underlying neurobiological pathways is essential for diagnosing sleep disorders, advancing neuroscientific research, and optimizing clinical interventions for patient health. eeg and sleep physiology ppt
During sleep, the EEG pattern changes significantly compared to wakefulness. The EEG waveform is composed of different frequency bands, including:
Marked by the definitive appearance of sleep spindles and/or K-complexes . The background remains LAMF theta activity. Deep, restorative sleep
The EEG shows a decrease in frequency and amplitude, characterized by . Alpha waves disappear. Stage 2 (N2) - Deeper Sleep: Characterized by specific, unique phenomena on the EEG:
Distinct bursts of 11–16 Hz activity (most commonly 12–14 Hz) lasting at least 0.5 seconds, maximal in central derivations. From the transient sleep spindles of Stage N2
An internal 24-hour clock regulated by the suprachiasmatic nucleus (SCN) in the hypothalamus. It responds to light and dark cues to regulate the timing of sleepiness and wakefulness.
