glutathione atherosclerosis system enhancement for cardiac protection: pharmacological options against oxidative stress and ferroptosis The association between metabolic syndrome

If the foot shock, called unconditioned stimulus (US), is paired with a neutral stimulus such as a sound or an environmental context (conditioned stimulus or CS), the animal rapidly learns to associate the CS with the US and will now freeze whenever the CS is presented alone (Kim and Jung, 2006)

A separate 2025 narrative review by McGuire and colleagues asked a blunter question in its title: "Regeneration or Risk?" [2] Their conclusion: the preclinical evidence is consistently positive, but the absence of human data makes it impossible to generate evidence-based practice guidelines

But it is worth being precise: these are proposed and studied mechanisms, not settled clinical facts

Together, they address both the hormonal and neurological components of sleep disruption