Sleep improvement composition

An object of the present invention is to provide a composition for improving sleep which contains theanine and other components that can be safely used on a daily basis without fear of side effects. The purpose is at least one selected from the group consisting of (a) theanine and (b) chamomile, lavender, Saint Jones Ward, Kawakawa, valerian, passionflower, tryptophan, γ-aminobutyric acid, serotonin, melatonin, and cedrol. It can be achieved by a sleep improving composition comprising two or more components.