Kanashibari

This seems to be the Japanese equivalent of Old Hag syndrome:

https://randalrauser.com/2011/02/awake-in-japan-a-first-person-account-of-demonic-oppression/

"From Sleep Paralysis to Spiritual Experience: An Interview with David Hufford"

From Sleep Paralysis to Spiritual Experience: An Interview with David Hufford by John W. Morehead.

David Hufford has been pursuing research on the "Old Hag" sleep paralysis phenomenon for quite some time. Perhaps his best-known work on this is The Terror That comes in the Night: An Experience-Centered Study of Supernatural Assault Traditions (Philadelphia, University of Pennsylvania Press; 2nd ed, 1989). Hufford joined the faculty of the Penn State College of Medicine in 1974 in the Department of Behavioral Science. When he retired in 2007 he held a University Professorship and was chair of the Department of Humanities with appointments in Departments of Neural and Behavioral Science, Family & Community Medicine, and Psychiatry. Hufford is now University Professor Emeritus at Penn State College of Medicine, Senior Fellow for Spirituality at the Samueli Institute, and Adjunct Professor of Religious Studies at the University of Pennsylvania. Hufford is also a founding member of the Editorial Boards of Explore: The Journal of Science and Healing and Spirituality in Clinical Practice.