A new study, published in The Journal of Neuroscience, reports that two chemicals in the brain cause paralysis in the body’s muscles during rapid eye movement sleep (REM). Previously, scientists believed that glycine alone caused this affect. Now, it appears that gamma-aminobutyric acid, or GABA, works in tandem with glycine. These findings could be contribute to understanding REM sleep behavior disorder, an early indicator or Parkinson’s disease. Read more at Science Daily.