What role does IgE play in sleep?

IgE (immunoglobulin E) is primarily known for its role in allergic responses. In individuals with allergies, elevated IgE can trigger symptoms such as nasal congestion, itching, or asthma, which are well-documented to disrupt sleep. Studies indicate that untreated allergic rhinitis is associated with poor sleep quality, daytime fatigue, and even sleep apnea. However, there is no strong evidence that IgE itself directly regulates sleep; the effect is indirect via the allergic inflammatory cascade. Therefore, an IgE test alone is not a diagnostic tool for sleep disorders. The evidence level is moderate: associations are observed but causal links are not established. For sleep issues, a comprehensive medical evaluation is recommended.