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@Dylan
your brachial Plexus ( a motorway of nerves underneath the armpit) is very sensitive to stretching,
and a crash where the arms are subjected to flailing or sudden intrusive movement, can disrupt those nerves and cause the kinds of symptoms you speak of.
Drunk people who have slept with their arm over the couch (stretching the brachial plexus) have been know to have numb arms for weeks after.
Time usually heals, permanent damage is only seen in very high energy situations like car crashes and such.