|  |  | August 7, 2009  The American Time Use Survey has determined that TV watching accounts for almost 50% of the two hours before and after bedtime. The research also showed that bedtime TV was correlated with sleep deprivation as well as increased obesity and mortality.
In times past, sleep cues like how sleepy the body feels and the going down of the sun signaled bedtime. Dr. Mathias Basner, MD, MS, MSc and Dr. David Dinges, PhD, of the University of Pennsylvania School of Medicine studied data gathered from 21,475 surveys of people aged 15 and older. They discovered, unexpectedly, that watching TV was the dominant cue for bedtime.
While people were staying up late to watch TV, they were still getting up at the same time for work and getting less sleep than is needed. As many as 40% of Americans sleep less than the recommended 7-8 hours each night. This sleep deprivation has been linked to problems such as obesity and higher mortality rates.
Dinges said, "Given the relationship of short sleep duration to health risks, there is concern that many Americans are chronically under-sleeping due to...
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