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  • Updated 02.12.2024
  • Released 09.09.1993
  • Expires For CME 02.12.2027

Sudden unexplained nocturnal death syndrome



In this article, the authors discuss sudden unexplained nocturnal death syndrome. Often fatal, it is a disorder that occurs in young adult Southeast Asian men who are otherwise healthy. This update includes new information on the availability and utilization of implantable defibrillators in Asian countries with a high incidence of SUNDS.

Key points

• Sudden unexpected nocturnal death syndrome is the most serious of sleep disorders as it affects otherwise healthy people, mostly young Asian men.

• There is an etiologic relationship between sudden unexpected nocturnal death syndrome and other conditions that can cause sudden cardiac death.

• Prevention is possible, as in the implantation of a defibrillator in near-miss cases.

Historical note and terminology

The Centers for Disease Control in the United States applied the term “sudden unexplained nocturnal death syndrome” to the syndrome first recognized in 1915 in the Philippines, originally called bangungut ("to arise and moan," the word for "nightmare") in the Tagalog language. In Japan, the syndrome was identified and named pokkuri ("sudden death") in 1959. In Thailand, sudden unexplained nocturnal death syndrome is called Lai Tai ("sleep death"); and in the Philippines, it is called Bangungut. Sudden unexplained nocturnal death syndrome has been identified in Southeast Asian male refugees, primarily the Hmong people, settling in the United States since 1975 and was the chief cause of death among these male refugees in the early 1980s, which was the peak time of Southeast Asian immigration to the United States (32).

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ISSN: 2831-9125