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)
Most educational presentations on this topic, such as those found on Slideshare and SlideServe , cover the following standard elements: eeg and sleep physiology ppt
Formerly divided into Stages 3 and 4, N3 is now defined as sleep where account for more than 20% of the epoch. It is extremely difficult to wake an individual from N3; if woken, they will be groggy and disoriented (sleep inertia). This stage is predominant in the first half of the night and is associated with restorative functions, such as tissue repair, growth hormone release, and glymphatic clearance of metabolic waste from the brain. When awake, EEG readings show "activated" brain activity,
A full sleep cycle typically lasts around 90-120 minutes and consists of stages 1-4 NREM sleep, followed by REM sleep. A normal night's sleep consists of 3-5 cycles. It is extremely difficult to wake an individual
(low-voltage, mixed-frequency) despite the body being in a state of muscle atonia. : A typical night includes 4–6 cycles of NREM and REM. Polysomnography (PSG) : Standard PSG montages