From the thread on sleep and hypertension:

Several articles:
from WebMD
from American Heart Association
from Yahoo! Health

Hypertension J publication May 2006:
Editorial
Original article

The above articles can be downloaded as PDF:
Editorial
Original article

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Sleep (night shift) and cancer:

Night Shift Work: Risk Factor for Breast Cancer?

Graveyard shift work linked to cancer, from Yahoo News

American J of Epidemiology Study - download PDF version by clicking here.

J of the National Cancer Institute article, Rotating Night Shifts and Risk of Breast Cancer in Women Participating in the Nurses' Health Study - download PDF file by clicking here.

Night Shift Work, Light at Night, and Risk of Breast Cancer - download PDF file by clicking here.

I'll dig up other sources. I know it's just hours of sleep, but also relationship to darkness. Well, one of the literature mentions this.

Gerry

Insomnia.
If the mind is racing, treat the heart.
If the mind is calm, treat the liver.

__________________
If you do what you've always done,
You'll get what you've always got.
www.meridiankinesiology.co.nz