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Juice Me Up, Scotty!!!
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2902103/
A recent experiment of sleep fragmentation led to different findings [93]. Following 2 nights of experimental sleep fragmentation across all stages, an increase in morning cortisol levels was observed, in association with a shift in the sympatho-vagal balance, estimated from the analysis of the heart rate variability towards an increase of sympathetic nervous system activity, and a decrease in insulin sensitivity.