It's more probably the fact that you're likely to be dreaming (about
50/50 at that hour), and the autonomic "storm" that accompanies REM
might be just enough stress to trigger a heart attack in those who were
about ready anyway.

As for non-heart attack deaths, I don't know, but I have read that heart
attacks peak in those early morning hours and again later in the morning
(work stress presumably).

Jean-Marc Perreault wrote:
> 
> Hi Tipsters,
>       One of my students brought forth an interesting
> comment in class today. We were discussing the sleep
> stages, and she asked whether it was true that when
> people die in their sleep, they tend to do so at
> around 4 am. She added that she had heard this was due
> to the fact that our bodies slow down at that time due
> to the ciracdian rythm, which could lead to a complete
> stop of the heart in older people.
> 
> Any ideas on this one?
> 
> Cheers!
> 
> =====
> Jean-Marc Perreault
> Arts & Sciences
> Yukon College
> Whitehorse, Yukon
> 867-668-8867

-- 
Thom

-----------------------------------------------------------------------
Thomas G. Brown, Ph.D.
Professor of Psychology
Distinguished Professor of the College

Utica College of Syracuse University
1600 Burrstone Road, Utica, New York, 13502-4892
Voice: 315/792-3187          Fax: 315/792-3702
-----------------------------------------------------------------------

"The best use of life is to spend it for something that outlasts life."

                                             - William James

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