Even Your Fat Cells Need Sleep  New research suggests that sleep
is even more important than we thought   Not getting enough
sleep can make you groggy, but can it also make you fat?
Researchers at the University of Chicago think it's a strong
possibility.  In a new study published in the Annals of Internal
Medicine, researchers determined that four nights of sleep
deprivation reduced insulin sensitivity in fat cells by a
whopping 30 percent. And the less sensitive your cells are to
insulin, the less your body produces the hunger-regulating
hormone leptin.  "This is one of the first studies to show that
a cell outside of the brain—the fat cell—also needs sleep," says
study author Matthew Brady, Ph.D., vice-chair of the Committee
on Molecular Metabolism and Nutrition at the University of
Chicago.  Brady and a team of researchers put seven young,
healthy subjects through two study conditions: First, they spent
8.5 hours in bed for four nights in a row (participants slept
for roughly 8 hours each night, the ideal