Listen to 睡眠改善薬 online. 睡眠改善薬 is an Instrumental language song and is sung by クリスマスソング. 睡眠改善薬, from the album 聖なる夜のBGM - 恋人達のクリスマス音楽、クリスマスキャロル, was released in the year 2019. The duration of the song is 3:36. Download Instrumental songs online from JioSaavn.