The sleep supplement market is saturated with plausible-sounding products and inconsistent evidence. This guide applies the same rigorous evidence-quality framework to sleep supplements that NeuroEdge applies to cognitive compounds: human RCTs with specific sleep outcomes, mechanistic coherence, and honest caveats. Tier 1 (Magnesium Glycinate and Glycine — both with direct RCT evidence), Tier 2 (L-Theanine, Ashwagandha KSM-66, Magtein®), and what doesn’t make the list (Valerian, 5-HTP, CBD) — with the reasoning for each exclusion.