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http://www.ncbi.nlm.nih.gov/pubmed/21286279

Curr Cardiol Rev. 2010 Feb;6(1):54-61.
Sleep duration as a risk factor for cardiovascular disease- a review of the recent literature.
Nagai M, Hoshide S, Kario K.

Division of Cardiovascular Medicine, Department of Medicine, Jichi Medical University School of Medicine, Yakushiji, Shimotsuke, Tochigi, Japan.
Abstract
Sleep loss is a common condition in developed countries, with evidence showing that people in Western countries are sleeping on average only 6.8 hour (hr) per night, 1.5 hr less than a century ago. Although the effects of sleep deprivation on our organs have been obscure, recent epidemiological studies have revealed relationships between sleep deprivation and hypertension (HT), coronary heart disease (CHD), and diabetes mellitus (DM). This review article summarizes the literature on these relationships. Because sleep deprivation increases sympathetic nervous system activity, this increased activity serves as a common pathophysiology for HT and DM. Adequate sleep duration may be important for preventing cardiovascular diseases in modern society.