Summary:
REM sleep correlates when we dream. This near-paralysis of muscles while dreaming is called REM-atonia and is lacking in people with REM sleep behaviour disorder. Instead of being still during REM sleep muscles move around often going as far as to stand up and jump yell or punch. Researchers set out to find the neurons in the brain that normally prevent this type of behaviour during REM sleep. When the researchers blocked the input to these neurons the mice began moving during their sleep just like someone with REM sleep behaviour disorder..