What is the Origin of Non-REM Arousal Threshold?

This is a technical term derived directly from polysomnography (PSG) studies, the gold standard for sleep measurement, where researchers quantify the intensity of stimuli needed to elicit an arousal event. It serves as a precise, objective measure of sleep depth and the brain's resilience to nocturnal disturbance.

What is the Mechanism of Non-REM Arousal Threshold?

The threshold is primarily regulated by the balance of activating and inhibiting neurotransmitter systems in the brainstem and forebrain, which modulate the brain's sensitivity to stimuli. Hormones like progesterone, which can have sedative effects, and the relative absence of stimulating cortisol contribute to raising this threshold, thereby protecting the continuity of deep, slow-wave sleep.

Non-REM Arousal Threshold ∞ Area

Non-REM Arousal Threshold

Meaning

The Non-REM Arousal Threshold is the level of external or internal stimulus intensity required to cause a brief awakening or a shift to a lighter sleep stage during Non-Rapid Eye Movement sleep. A higher threshold indicates more stable and restorative sleep continuity, protecting the crucial deep sleep phases necessary for hormonal release and cellular repair. Conversely, a low threshold suggests fragmented sleep, which severely impairs the systemic restoration sequence.