SLEEP QUALITY IMPROVER AND SLEEP QUALITY-IMPROVING COMPOSITION, DAYTIME PRODUCTIVITY IMPROVER AND DAYTIME PRODUCTIVITY-IMPROVING COMPOSITION, AS WELL AS CONCENTRATION IMPROVER AND CONCENTRATION-IMPROVING COMPOSITION

To provide a sleep quality improver and a sleep quality-improving composition having excellent sleep quality-improving effect and high safety, to provide a daytime productivity improver and a daytime productivity-improving composition having excellent daytime productivity-improving effect and high safety, and to provide a concentration improver and a concentration improving-composition having excellent concentration-improving effect and high safety.SOLUTION: Provided are a sleep quality improver, a daytime productivity improver, or a concentration improver containing a compound represented by structural formula (1); and a sleep quality-improving composition containing the sleep quality improver, a daytime productivity-improving composition containing the daytime productivity improver, or a concentration improving composition containing the concentration improver.SELECTED DRAWING: None 【課題】優れた睡眠の質向上作用を有し、かつ安全性が高い睡眠の質向上剤及び睡眠の質向上用組成物、優れた日中の生産性向上作用を有し、かつ安全性が高い日中の生産性向上剤及び日中の生産性向上用組成物、並びに優れた集中力向上作用を有し、かつ安全性が高い集中力向上剤及び集中力向上用組成物の提供。【解決手段】構造式（１）で表される化合物を含む睡眠の質向上剤、日中の生産性向上剤、又は集中力向上剤、並びに、前記睡眠の質向上剤を含む睡眠の質向上用組成物、前記日中の生産性向上剤を含む日中の生産性向上用組成物、又は前記集中力向上剤を含む集中力向上用組成物である。【選択図】なし