Atama no yoku naru yojikan suiminhō
By: Sakai Hiroshi.
Edition: Shohan.
Series: Mukku serekuto -- 352
Publisher: KK Rongserāzu
Published: 1990
Place of publication: Tōkyō
Language: jpn
Number of pages: 218
Subjects: Sleep -- Health aspects.
Other titles: Yojikan suiminhō; 4-jikan suiminhō