Hello 
I think what your brother experienced is a malfunctioning of the REM Atonia phase. Question: Does this happen to him often? (Because if not, as gab said, maybe he was just shifting around for a comfy spot )
Anyway, here is a quote from a post on REM sleep and atonia.
We need something to prevent us from acting out our dreams of course. The REM atonia phase prohibits the body from acting out dreams. This happens when motor neurons in the spinal cord become inactive, leaving us unable to move or else you would probably kick your bed partner every time you have a dream that involves running. This is not to be confused with sleep paralysis. Sleep paralysis is simply the experience of being paralyzed while assumed to be asleep.
REM Behavior Disorder (or RBD), is a sleep disorder (more common in older males) that involves the REM atonia phase malfunctioning, resulting in the sleeper acting out his/her dreams. This is when the motor neurons are reactivated, resulting sometimes with hurting their bed partner, themselves, or destroying items on their nightstand.
This is the link to the full post, if you're interested: http://www.dreamviews.com/f33/rem-sl...ml#post1482408
Hope that helped, see ya around!
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