Highlight
– Daily consumption of 40 g walnuts significantly increases evening urinary 6-sulfatoxymelatonin (6-SMT) levels.
– Walnut intake improves sleep latency and overall sleep quality in young adults.
– Higher urinary 6-SMT concentrations correlate with improved sleep efficiency and reduced daytime sleepiness.
– Tryptophan and melatonin in walnuts may mediate the sleep-promoting effects observed.
