What role does IgG play in sleep?

The provided context does not address the role of IgG in sleep. Generally, IgG (immunoglobulin G) is the most abundant antibody in blood and a key component of adaptive immunity. Sleep is known to influence immune function; for example, sleep deprivation can reduce antibody responses to vaccination. However, a specific, direct role of IgG in sleep regulation is not well established. Most research focuses on cytokines like IL-6 or TNF-α rather than IgG. Some small studies suggest weak associations between IgG levels and sleep quality, but the evidence is mechanistic and inconsistent. Without robust clinical trials or validated biomarkers, any claim linking IgG to sleep remains speculative. Consumer DNA or microbiome tests claiming to assess sleep via IgG lack scientific support. Evidence level: unclear. Safety note: No direct harm, but misinterpretation may lead to unnecessary interventions. Sources: none from context.