Our expert says:
Basically you can see this as him acting out his dreams. Normally, the muscles of the body become paralysed at that time, which prevents this happening.
In itself, this is not a problem. However, people have been known to injure themselves or others while this is happening, so it is advisable to get help.
We are usually able to control this with medication, but he needs to see someone who understands the condition, to make sure about which particular variety of the condition we are dealing with.
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