This...
"Bob was eventually diagnosed with REM Behavior Disorder or RBD — a condition that occurs in the REM stage of sleep. "
...is unfortuately very real. And very fucking scary...both to yourself and those you love...especially when you are big and strong enough that you could do some real damage.
I am glad that the medical community is finally gettign around to diagnosing and socializing that this condition is out there, versus telling people "umm...I dunno" or be called a liar, which is what I heard for years...